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Online since: June 2012
Authors: He Zhao, Yang Liu, Qiao Xin Zhang
Use the structured hypergraph to conduct formal description of parts and modules information and establish structured model; then fuse constraint information of the structure model based on the multi-scale data fusion technology, and provide constraint data source for changed coefficients of the components and modules.
At the same time fusing the components and modules model data by introduce the multi-scale fusion technology, which provide important constraint data source for the variant design.
One important aspect of multi-scale structured hypergraph-based modeling process is to structure the variety of physical objects and data objects and their linkages.
The hypergraph structured is a continuous abstract and reduction process.
Then, conduct multi-scale data fusion to correlation matrix A and collection matrix Q based on multi-scale algorithm which will be represented in next section.
Online since: July 2020
Authors: Anders Hallén, Muhammad Nawaz, Daniel Johannesson, Staffan Norrga, Keijo Jacobs, Hans Peter Nee
In this paper, a technology computer-aided design (TCAD) model of a silicon carbide (SiC) insulated-gate bipolar transistor (IGBT) has been calibrated against previously reported experimental data.
(b) (a) Fig. 2. a) TCAD calibration results of the forward characteristics, IC-VCE, compared to experimental data of a 22 kV SiC IGBT [7]. b) Charge-carrier lifetime-dependent breakdown voltage characteristics of the four theoretical SiC IGBTs with 20-50 kV blocking voltage capability (τA,LOW = 1 μs vs. τA,HIGH = 100 μs).
Summary A 4H-SiC IGBT TCAD model has been calibrated against experimental data and has been used to widely investigate static performance of high voltage SiC IGBTs (20-50 kV).
The calculation indicates that a conduction loss energy reduction of 30 % may be achieved by using 30 kV SiC IGBTs.
Furthermore, the wide range simulation data may serve as input to future converter evaluation studies in various high-power applications.
Online since: July 2014
Authors: Fernando M.B. Marques, Daniel A. de Macedo, Aleksey A. Yaremchenko, Dulce M.A. Melo, Filipe M. Figueiredo, Flávia M. Aquino
Rietveld XRD data refinement were carried out using CGAS computer program to estimate lattice parameters and identification of the compounds were performed by comparison with data from JCPDS.
Impedance data were corrected for electrode area and divided by two (symmetric cell) to obtain the ASR of each cathode.
Based on the XRD data, lattice parameters were calculated, see Table 1.
Table 1 – Lattice parameters obtained by Rietveld of XRD data.
(a) (b) Figure 4 - Experimental impedance plot data fitted with equivalent circuit by Zview for the tested materials at 650 °C (a) BSSCF and (b) BSNCF.
Online since: November 2011
Authors: P.S. Sreekanth, N.Naresh Kumar, S. Kanagaraj
It is observed that the percentage reduction in Young’s modulus, yield stress and % strain at fracture of 0.4% composite at 50 kGy dose are 6.4%, 8.8% and 12.7%, respectively compared to that of virgin UHMWPE irradiated at same dosage.
The reported results are an average of data obtained from the four specimens.
The numerals in brackets indicate the percentage reduction of properties compared with respective unirradiated composite of same composition.
It can also be observed that the percentage reduction in material properties increased with irradiation dosage, however decreased with CNT concentration.
· The reduction of mechanical properties due to shelf ageing after subjecting to irradiation has been relatively less for MWCNTs reinforced composites
Online since: November 2012
Authors: Qi Fen Li, Tao Li, Cui Cui Pan, Zhi Tian Zhou, Li Feng Zhao, Wei Dong Sun
According to the data, the quantity of energy saving is calculated.
The data is shown in Table 1 and test date is Jan 19. 2012.
Table 1 Floor air test data Time RH (%) Air supply temp.
The data are shown in Table 2.
Table 2 Floor new air test data Time RH (%) Air supply temp.
Online since: June 2007
Authors: Tadahiro Kawase, Hiroyuki Shiozaki, Toshitaka Iwauchi
In Experiment II, actual data for µs is obtained from rolling experiments using the R & F method.
An example of a typical rolling data chart is shown in Fig. 7.
When the top end of the lumber initially touched the rolls, time and all of the measured data were reset to zero.
A data chart for two continuously rolled lumbers is shown in Fig. 10.
If ∆µeq2 from the experimental data is substituted into Eq. (7), an increment of horizontal force F2 is obtained.
Online since: April 2009
Authors: Xin Zhe Lan, Yong Hui Song, Yong Yang, Wen Wen Gao
XRD analysis confirmed that the reduction product was element silver.
Generally, silver nanoparticles can be prepared by physical and chemical methods; the chemical approach, such as chemical reduction, electrochemical techniques, and photochemical reduction is most widely used [4, 5].
Herein, the present paper investigates the effects of the anionic surfactant sodium dodecyl benzene sulfonate (SDBS) and water-soluble macromolecules PVP for synthesis silver nanoplate by chemical reduction method. 2.
The min. value of surface tension was of 33.12mN/m with the CMC of 0.8g/L in the SDBS solution system, while the min. surface tension was of 60.91mN/m with the CMC of 0.1g/L in the PVP solution system. 0.0 0.5 1.0 1.5 2.0 30 40 50 60 70 0.0 0.5 1.0 1.5 2.0 30 40 50 60 70 SDBS SFT(mN/m) C (g/L) PVP Fig.1 Surface tension of SDBS or PVP single aqueous solutions The reduction of hydrazine hydrate in SDBS or PVP solution, which concentration was greater than their CMC, the as received dispersed particles SEM results are shown in Fig.2, combining with Fig. 1, one can find that the anionic surfactant SDBS significantly reduced the surface tension of the solution due to the interaction of its hydrophilic group (-NaSO3) and hydrophobic group (-C18H29) with the aqueous solution, especially the self-assembled micelles helped to direct the growth of nanoparticles to form plate structure.
The calculated cell parameter was 4.086 Å, which is consistent with the reported data (JCPDS File no. 4-0783).
Online since: October 2014
Authors: Vlad Martian, Alexandru Rus, Mihai Nagi
Heat exchanger tank height reduction could bring benefits like overall size reduction or increased heat transfer area within the same overall dimensions, if the reduction does not have a negative influence on the cooler's pressure drop.
The comparison is illustrated in Fig. 4.Once the solution's independence from the mesh is obtained and satisfactory agreement is found between numerical and experimental data, we proceed to alter the water inlet and outlet tanks height.
Fig. 4 Comparison between experimental and numerical data As we can observe from Fig. 4, the numerical model under predicts the pressure drop resulted from the experimental investigation.
Fig. 5 presents the pressure drop variation with the tank height reduction for each simulated water flow.
Analysis of the results reveals that there is no notable change in the pressure drop curve with the reduction of the water inlet and outlet tank height.
Online since: July 2024
Authors: Rashid Mustafa
Approximately 50% isolation efficiency was reported or approximately 50% reduction in lateral earth thrust is observed.
Most data display a correlation between EPS density and young’s modulus of elasticity.
They have used ABAQUS software to know the effect of EPS geofoam on the reduction of lateral earth pressure.
So MS Excel is used to filter this data and the values of earth pressure are taken approximately at the interface.
Data availability statement: The data presented in this study are available on request from the corresponding author.
Online since: December 2012
Authors: Yu Zeng Zhang, Shan Chai, Xue Jian Jiao
According to the experimental data, the damping parameter was calculated by means of the response surface method.
The reduction of Magneto-rheological vibration system adjusts the damping force by controlling the magnetic field intensity because Magneto-rheological fluid changes greatly under the effect of magnetic field.
According to the Lenz's law, the induced magnetic field generated by the induced current is always hindering the change of magnetic flux density; therefore, the induced magnetic field is able to slow down the relative motion between the permanent magnets and plays a role in vibration reduction.
According to the practical engineering experience, quadratic polynomial was usually selected and its form is written by: (11) Where is fitting function, αi is an undetermined coefficient and xi is a data point.
In this paper, the distribution for magnetic induction intensity of induction coils was got by using the matlab programming in [10] and the coefficient of magnetic induction function was fit by using response surface method of quadratic polynomial through screening of the reasonable data points.
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