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Online since: June 2020
Authors: Eleonora Koltsova, Natalia Mamonova, Anna Shaneva, Michael Babkin, Nelly Popova, Eugene Zharikov
The data on the grinding kinetics of Al2O3 particles were taken.
Experimental data on the grinding of particles of aluminum oxide are presented in Table 1.
Experimental data on the grinding of aluminum oxide Experiment No.
The following relationships are derived: (7) (8) where η1 and η2 – the rate of reduction of pore size at the 1st and 2nd stage of sintering; k1 and k2 – are phenomenological coefficients taking into account the dependence of the pore reduction rate on the amount of CNTs СCNT (parameters a1 and a2), the current pore size l and the current temperature in the furnace chamber T; m1 and m2 are constants characterizing the degree of deviation of the system from equilibrium for the 1st and 2nd stages of sintering, respectively.
From the comparison of the calculated and experimental data on the average size and moments of the density function of the particle size distribution, the kinetic parameter L was determined by equation (3) as L = 7.2·10-3.
Online since: June 2013
Authors: Ricardo Pinheiro Rulli, Fernando Dotta, Paulo Anchieta da Silva
In addition, Embraer believes that SHM can also provide facilitated damage detection in areas with restricted access, early detection of structural damages and reduction of maintenance costs for current and future aircrafts.
Unlike CVM, Lamb Waves approach is more complex and requires a high speed DAQ (Data Acquisition) hardware and sophisticated computer algorithms to handle all data signals.
(a) Thickness reduction in aeronautical aluminum; (b) Delamination detection in carbon fiber reinforced polymer (CFRP) In addition, LW sensors were installed in the E-Jets FSFT and in the barrel test article.
And, the A-SHM application type will be the installation of not only sensors and cables but also SHM interrogators and data recorders into the aircraft.
Compliance with other standards, such as RTCA/DO-200A (Standards for Processing Aeronautical Data) or RTCA/DO-254 (Design Assurance Guidance for Airborne Electronic Hardware) may also be required, depending on the on-board equipment complexity.
Online since: June 2014
Authors: Chun Rong Ma, Yu Lin Yang, Ji Gang Chen, Lin Lin Cui, Xiao Tian Zhang
A method of loading by displacement was used in the simulation, and the initial value of rolling process parameters is shown in Table 1: Table 1 Technic parameters of simulation model of rolling Parameter Cumulative reduction Pressure speed Rotate speed of rolling head Values 4.5mm 1mm/s 600r/min Boundary conditions.
It could be seen that difference between the two algorithms is not obvious, but the results obtained after optimization have significant reduction when compare with results before optimization, and the maximum stress after optimization reduced by about 50%.
Comparing with the data obtained from simulation before optimization, the data after optimization had been greatly improved.
Comparing with the data before optimization, maximum residual stress of outer ring after optimization reduce by about 25%, the contact stress of inner surface is less than 10MPa, and by analyzing the simulation results, it can be known that the maximum dimensional deviation is less than 0.03mm
Optimization and experimental analysis in this paper provide a theoretical basis and the underlying data for the study on forming process of self-lubricating spherical plain bearings’ outer ring.
Online since: August 2021
Authors: Alexander I. Ushakov, Ivan S. Safronov
Currently there are no unambiguous data confirming the clear correlation in the changes in the microhardness and plastic characteristics [26, 27].
Some data confirm the possibility of forming the certain properties on the local defect sites when exposed to a given number of laser pulses lasting several nanoseconds [8, 26-28].
The structural changes are confirmed by the data of the X-ray diffraction analysis, which made it possible to distinguish the metastable amorphous-nanocrystalline structures corresponding to the annealing temperatures: 748-823 K, 853-888 K, 903-943 K, 973-1023 K [20].
Fig. 1 shows the obtained experimental data on the dependence of microhardness on the distance to the center of the melting zone.
Bruening, Catalytic nanoparticles formed by reduction of metal ions in multilayered polyelectrolyte films, Nano Letters. 2(5) (2002) 497-501
Online since: September 2017
Authors: A.V. Tukhareli, V.D. Tukhareli, Tatiana F. Cherednichenko
The Practical Significance, Suggestions and Implementation Results, Experimental Data Acrylic polymer additive characterized as a hydrophobic plasticizing modifier containing a microfill pigment and mineral supplement will have a positive effect on improving the corrosion resistance of concrete.
However, these tests give a wide space of data, with a coefficient of variation of 13.5% set by GOST 18105-86 for the concrete strength hardening in water [17, 20].
The minimum size of the sample, which reduces the spread of the data should be used in tests for corrosion resistance, is 2.5×2.5×10 cm, in terms of flexural strength.
In the sulfuric acid solution, weight reduction of samples was 60%, the penetration of the acidic environment in the depth of the samples was reduced 5 times, chemical resistance increased by 13%.
The research data demonstrates the effectiveness of concrete modification by polymer additives, which is the primary protection.
Online since: May 2010
Authors: William H. Peter, Adrian S. Sabau, Yukinori Yamamoto, Jim O. Kiggans, Michael B. Clark, Stephen D. Nunn
These require less energy than conventional reduction technologies while providing pure titanium and titanium alloy powders that are suitable for powder metallurgy consolidation.
The process simulation requires the material property data, which is available in the open literature.
However, the following data need to be measured for the Armstrong powder: Young's modulus, bulk modulus, failure line for the plasticity model, and compaction plasticity model parameters.
The testing of the data acquisition system (for the measurement of the axial displacement, axial stress, and radial strain) for uniaxial compression of cylindrical samples under increased loading is currently in progress.
The process simulation requires the material property data which are currently being measured for the new Armstrong powder.
Online since: July 2011
Authors: Fu Hua Kuang, Gui Yun Liu, Bu Gong Xu
Belden company, whereas in other cases the 9841 shielding twisted-pair cable (24AWG) by Belden company, which can guarantee the stability of the data.
The In CAN bus network, the maximum line length is essentially determined by the following physical conditions: ① the loop delay of connected bus nodes (CAN controller, isolator, transceivers, etc.) and the delay of bus line transmission; ② bit timing error caused by oscillator tolerance of different nodes; ③ signal amplitude reduction caused by the bus cable series impedance and input impedance of the bus nodes. 
In condition 1 and 2, bit timing determines the maximum bus length; in condition 3, signal reduction determines the maximum bus length. 
When the sending node sends data, waiting to receive from the response node, but the transmission delay increases to the amount of the two-bit response field of CAN, the CAN-bus can not receive a response signal, which leads to communication failure. ②The increase in bus length also results in the increase of junction capacitance between the differential lines CAN_H and CAN_L, resulting in slowing down the rising edge of waveform difference signal, so that the actual bit time becomes smaller; when the bit rate changes beyond the tolerance range, the receiver can not normally receive the data
In such condition, without terminal resistances, the anti-interference and data communication reliability can reduce greatly; sometimes it can even bring about control failure.
Online since: October 2015
Authors: Wolfram Volk, Andreas Krinner, Thomas Thümmel, Tim Benkert
The parts are sliced into layers of 150 microns thickness and the data transferred to a laser sintering device.
This platform holds the electric engine to drive the prototype and the sensors to collect data during operation.
Measurement data are generated by one path sensor and five acceleration sensors.
Due to reduction of simulation time, the press frame, the platform and the drivetrain are not considered.
To match calculated and measured data it is necessary to work further on the computed results since the simulation neglects the platform and the spiral springs it sits on (see section ‘simulation’).
Online since: January 2009
Authors: Jerzy Lis, Stanisława Jonas, Karol Kyzioł, Katarzyna Tkacz-Śmiech
The presented data points and contours were generated from the series of the measurements: d& vs.
The deposition rate in nm/hour; contours every 50 nm/hour It clearly results from the presented data that heating of the substrate causes reduction of the deposition rate.
Simultaneously, as it results from the data for the series B, the layer-growth rate achieved under the pressure of 100 Pa (but keeping PRF = 60 W and Ts = 80 oC) accounts for nearly 250 nm/hour.
Thus, reduction of the negative temperature effect through the application of risen power not only ensures higher growing rate but also gives favourable conditions to increase nitrogen content in the layer.
The data reported in this work concern a role of the temperature, gas pressure and RF plasma power.
Online since: July 2017
Authors: Bernd Wetzel, Mark Kopietz, Fatih Bilgin, Sergiy Grishchuk
Furthermore, a bio-content was added to the 2P matrix for decreasing greenhouse effect via reduction of CO2 emission.
Table 1: Specific data regarding used coupling agents Name Chemical species V [vol%] Efka® SL3035 Organically modified polysiloxane 1.0 Hydropalat® WE3485 Modified sulfocarboxylic acid ester 0.5 Efka® WE3110 Ethoxylated long chain alcohol in water 1.0 The matrix resins were prepared at ambient conditions.
Representative stress-strain curves and data resulting from the tensile tests are shown in Figure 3.
It is worthy to note the positive influence of WE3110 on the tensile strength of 2P resin without reduction in tensile modulus.
All obtained mechanical data are summarized in Table 2.
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