Search Options

Sort by:

Sort search results by

Publication Type:

Publication Type filter

Open access:

Publication Date:

Periodicals:

Periodicals filter

Search results

Online since: November 2016
Authors: Chima Benjamin Njoku, Patrick Gathura Ndungu
James et al., discussed the structure of ceria doped strontium materials based on XRD and neutron diffraction data, and showed that the Ce4+ or Sr2+ will occupy the A-site [28].
Reduction reaction was more dominant in the samples calcined at a 1000 °C because of its steady weight decrease throughout the process.
Previous work by Rupasov et al have shown that an increase in oxygen diffusion can lead to a reduction in the ASR [41].
From the XRD data, the materials had mean crystallite sizes of 64.78 nm, 47.10 nm, 27.32 nm for the samples calcined at 1000 °C, 900 °C and 800 °C respectively.
Gauckler,, Thermodynamic data of Ba0.6Sr0.4Co0.8Fe0.2O3−δ SOFC cathode material.
Online since: June 2014
Authors: Carlos Kenichi Suzuki, Eduardo Ono, Murilo Ferreira Marques Santos, Christiano Pereira Guerra
Results and discussions Data obtained from the analysis of impurities by ICP-MS of the sample of quartz powder QP.SR (not leached) shown in Table 2 were compared with the data of the quartz powder QP.KY.
Samples produced with the powder QP.SR leached showed a reduction in the average content of bubbles in relation to the silica glass powder produced with QP.SR without leaching (Table 3).
SG.SR3 SG.SR10 SG.KY1 SG 25A / SG 25B Transmittance in 200 nm 55.8 59.4 15.1 40* Transmittance in 254 nm 85.1 84.9 85.9 78* TVIS (400 to 800 nm) 90.3 91.5 91.7 NA * Estimated values from data provided by manufacturer.
NA – Not available data.
The leaching of the quartz powder enabled a reduction of bubbles concentration to the same level as the silica glass produced with of high purity imported quartz powder.
Online since: May 2015
Authors: Ashkhotov Oleg, Irina Ashkhotova
Our data agree well with [1, 2, 6, 7], except [5], in which the energies was less than the listed transitions our values ​​by 3-4 eV.
EELS spectra of oxidized aluminum on our data are characterized by a peak with an energy of 20.4 eV.
Together, these factors lead to a significant reduction of the sputtering of aluminum oxide, which becomes significantly less than the same parameter for the pure metal.
According to our data, the low alumina sputtering coefficient at argon ions energies up to 2 keV does not give the desired result, and it was shown in [17 ] that Al2O3 practically impervious to etching by Ar+ ions with an energy of ~3 keV.
We may assume that the emergence of these peaks was due to the formation of aluminum nitride, but the EELS spectra for AlN were found to contain only a volume plasmon peak of 20.46 ± 0.01 eV according to the data in [18, 19], thereby conflicting with spectrum 2 in Fig. 4.
Online since: November 2016
Authors: Miloš Janeček, Jozef Veselý, Veronika Polyakova, Kristína Václavová, Irina Semenova, Josef Stráský, Svetlana Gatina
All data points were used for the calculation, i.e. both from the measurement on the disc surface and in the disc cross-section.
Data corresponding to the leaking off the material near the edge of the discs were neglected and fitting with weighting was employed.
It is clear, that the combined Hollomon-Voce fit matches the experimental data much better than the individual models.
For comparison, analogous fitting procedure was employed for microhardness data for Ti6Al4V alloy deformed by HPT as reported in [15].
Moreover, neglecting the reduction of sample thickness during HPT may also affect the result of fitting.
Online since: August 2014
Authors: Ying Hai, Jing Yu Chen
The proposed method is tested with both simulated data and field data obtained from Laboratory .
(10) where is an identity matrix .selection other sampled signal Y(n-1) ,define the autocorrelation matrix of X(n) and Y(n-1) as (11) Applying shift invariance property, and can be related using a matrix, whose eigenvalues represent the exponential terms of (10) as (12) The frequency components are obtained from the eigenvalue of the matrix as follows (13) In order to estimate amplitude and initial phase angles from the sampled data sequence ,alternatively, in the form of a complex exponential model, the same signal can be expressed as (14) where is the complex amplitude, which is related
Block schematic of frequencies and power estimation Simulation And Experimental Results The proposed method is tested using computer-simulated and laboratory obtained data records.
With the ever growth of processor speed and in the same time the reduction in their prices, subspace methods have the potential to be very promising tools for the PQ industry.
Future study, therefore, will be focused on the further reduction of the computational time.
Online since: January 2016
Authors: K. Rohit, A. Raja, Vivek Pancholi
Some work on reduction in thickness variation through microstructural control has been introduced and studied recently [9]–[13].
Table 2: Values of the co-efficient 𝑏2 and slope data obtained by best fit line to the thinning factor data (section on thinning factor) FSPed fine grain percentage fraction in microstructure Value of b2 Slope 25% -0.36 -0.9409 50% -0.56 -0.9245 72% -0.97 -0.5972 100% -0.88 -0.835 Effective strain.
Therefore, any deviation from the ideal condition can be characterized using slope of the linear best fit line to the data of thinning factor [10], [14].
From Fig. 4 and slope data listed in Table 2, it is clear that the slope of 72% processed condition is found to be lowest which indicate that the thickness of the bulge in this case is nearly uniform.
Reduction in thickness variation in the superplastically formed components requires higher m value (strain rate sensitivity).
Online since: August 2014
Authors: Rong Zhang, Shu Cai Wang, Kai Zhang, Xiong Feng Xie
When the load≥0. 1N, start monitoring the test data.
When the eggshell obvious burst (reduction ratio: 60%), the test is over.
When the breakage of eggshells reached the reduction ratio which the researchers set, the stress was reached zero.
Scatter diagram of max force in different loading sites The test data showed that their maximum resistances were higher than the other samples of the same group.
data for transportation, packaging, and storage of egg products.
Online since: February 2011
Authors: Wan You Zhang, Yu Miao, Hai Feng Zhang
In the experiment, data were collected and comparatively analyzed through statistics, matched curve, established the mathematical model by Design-Expert 7.1 software, and finally the optimum operation conditions of the CCMER were determined.
After entering data, Design-Expert 7.1 software will collect, analyse data, compare and definite the model.
As it is seen from table 4,the effect of quadratic equation model test data is obvious.
That hinders oxidation-reduction reaction in the system, and finally reduces the efficiency of phenol wastewater treatment.
The process of iron-carbon micro-electrolysis contains electrochemistry ferrum dissolution, acid dissolution, nascent state hydrogen atom reduction, oxidation by aeration, strong reducing property of nascent state ferrous hydroxid and precipitating action of iron salt in coagulation process.
Online since: May 2011
Authors: Jia Min Zhang, Ming Yi Zhu, Zhao Xun Lian
Table 1 The injection molding process parameters of PA1010 products with silver inserts Project Data Project Data Injection machine/g 250 Cooling time/s 30 Nozzle voltage/V 175 Injection pressure/ MPa 3 Barrel temperature/°C 220 (ahead) Holding pressure/ MPa 2.5 210(central) Pre-plastication pressure/ MPa 10 200(back) Back pressure/ MPa 1 Injection time/s 10 Output/mm 60 Holding time/s 5 Cooling approach Air cooling Design and processing of inserts The silver inserts in the products will have 10mm to be coated by melted PA1010, to ensure the silver inserts not to rotate by force after the cooling of injection products, so we design this part into hexagonal shape, to avoid the appearance of small gap between silver inserts and PA1010 lead by inconsistencies of contraction, so take the way that open multi-channel at the coated part of silver inserts.
Results and Discussion Caculation of impact strength The data of the impact strength of PA1010 is showed in table 2.
Table 2 The impact strength data of PA1010 material Sample number Gap width (mm) Thickness or gap remain thickness (mm) Work done (J) maximum Load Average work(J) Impact strength (kJ/m2) 1 15.00 7.02 1.9 1.9 2.0 1.8 1.9 18.0 1.9 1.9 2.0 1.9 2 15.00 7.04 2.5 2.9 2.7 2.7 2.7 25.6 2.8 2.6 2.5 2.9 3 15.00 7.02 2.4 2.6 2.2 2.3 2.4 22.8 2.4 2.5 2.3 2.5 4 15.00 7.06 2.0 2.2 2.4 2.4 2.2 20.8 2.0 2.1 2.2 2.3 5 15.00 7.02 1.7 1.9 2.0 1.9 1.9 18.0 1.8 2.1 2.0 1.8 6 15.00 7.02 2.8 2.6 2.6 2.6 2.7 25.6 3.0 2.6 2.8 2.4 7 15.00 7.04 3.0 3.2 3.0 3.0 2.6 24.6 2.6 1.8 1.6 2.6 8 15.00 7.02 2.4 2.8 2.4 2.4 2.3 21.8 2.2 2.4 2.0 2.0 9 15.00 7.06 3.2 1.6 2.4 2.2 2.2 20.8 1.4 3.0 2.0 1.4 10 15.00 7.02 2.4 1.8 2.0 3.0 2.2 20.9 2.0 3.0 1.8 2.0 Mold temperature For the crystalline plastics, the influence of mold temperature on the impact strength is mainly reflected in the degree of crystallinity. when the crystallinity is high, the spherulite size increases, it will also decrease the impact
Injection rate Both the over high and over low injection rate can cause the reduction of the impact strength.
The reason of the impact strength reduction caused by over low injection rate is that the over low shear rate wouldn’ t occur frozen in orientation in the flow direction.
Online since: November 2011
Authors: Hong Jie Pei, Gui Cheng Wang, Lei Yang, Wei Song, Wen Jie Zheng
Vibration tapping is an important application of this new technology and can bring many advantages such as reduction of cutting force, improvement of thread quality, a better performance of chip removal and so on [1].
They found that the smaller size tap is used, the more reduction in torque can be observed [3].
R is the average maximum torque value of the repeated trials’ data.
So it is calculated from the following equation: (1) Where y is the trial’s data and n is the number of trials.
Table 3 shows the data for maximum tapping torque and S/N ratio.
Showing 12711 to 12720 of 40357 items