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Online since: January 2012
Authors: Chang De Hu, Mei Rong Zhao, Xiao Bei Deng, Sha Zhu
Therefore once the micro-cantilever surface absorbing the molecules to be tested, the micro-cantilever quality increasing, this causes a reduction in the frequency response .Then the measured substance could be quantitatively analyzed by detecting changes of micro-cantilever resonance frequency.
detection circuit computer micro- cantiliver piezoelectric film excitation signal voltage signal u current signal i data acquisition Fig.2 The block diagram of piezoelectric micro-cantilever system As Fig.2 shown, the system working process is described as follows: with the piezoelectric micro-cantilever fixed on the stent, sine voltage excitation signal is applied to piezoelectric film of the micro-cantilever through the analog output ports of a data acquisition card.
To keeps invariant for the amplitude of the excitation signal, then do a frequency scan[7] for the data acquisition card output signals controlled by computer, at a given frequency range by a small enough frequency interval, for a certain time at each frequency.
Finally, the voltage signal is recorded in computer through data acquisition card.
detection circuit computer micro- cantiliver piezoelectric film excitation signal voltage signal u current signal i data acquisition Fig.2 The block diagram of piezoelectric micro-cantilever system As Fig.2 shown, the system working process is described as follows: with the piezoelectric micro-cantilever fixed on the stent, sine voltage excitation signal is applied to piezoelectric film of the micro-cantilever through the analog output ports of a data acquisition card.
To keeps invariant for the amplitude of the excitation signal, then do a frequency scan[7] for the data acquisition card output signals controlled by computer, at a given frequency range by a small enough frequency interval, for a certain time at each frequency.
Finally, the voltage signal is recorded in computer through data acquisition card.
Online since: June 2018
Authors: Eddy Aeloiza, Arun Kadavelugu, Pietro Cairoli, Rostan Rodrigues
These features of SiC devices allow significant reduction in size and weight of power conversion systems, while increasing their efficiency, performance and reliability.
Extensive field data on long-term short-circuit capability of SiC MOSFETs is not currently available in the literature or in device datasheets, which makes it further difficult to design a reliable gate driver and protection circuit.
Also, these short circuit results are in consistent with the data published in [8].
The test data of the SiC MOSFET after 100 short-circuit tests (with fast protection) is compared with the data before the device is subjected to any short-circuit condition.
Extensive field data on long-term short-circuit capability of SiC MOSFETs is not currently available in the literature or in device datasheets, which makes it further difficult to design a reliable gate driver and protection circuit.
Also, these short circuit results are in consistent with the data published in [8].
The test data of the SiC MOSFET after 100 short-circuit tests (with fast protection) is compared with the data before the device is subjected to any short-circuit condition.
Online since: February 2019
Authors: Liudmila Shtirc, Svetlana G. Vlasova, Dmitry Meshcherskikh
The increase of the foaming coefficient indicates a volume mass reduction of the sample.
Analyzing the data received, it can be concluded that in order to obtain a lighter foamed glass, the SO3 content should be not less than 0.3% in the primary composition with more than 4% of iron oxide content.
Dependence of the foaming coefficient on the initial temperature in the furnace* Тinitial, [оС] in the furnace Gassing agent, [wt. %] Foaming time, [min] Foaming coefficient (Kv) 27.5 silica, 0.5 30 1.5 100 silica, 0.5 30 1.61 200 silica, 0.5 30 1.75 300 silica, 0.5 30 1.88 * example from composition #2 Analyzing the data received, it can be concluded that when the initial temperature in the lab furnace increases, the foaming kinetics changes.
Analyzing the data received, it can be concluded that to obtain a foam material with the most equal porous structure, it is necessary to use a 25% NaOH solution as a foaming agent and to maintain the maximum foaming temperature in a lab furnace of 890°C.
Conclusion According to the experimental data, in order to obtain a lighter foam material it is necessary to have a SO3 content in the original glass composition of at least 0.3% with an iron oxide content of more than 4%.
Analyzing the data received, it can be concluded that in order to obtain a lighter foamed glass, the SO3 content should be not less than 0.3% in the primary composition with more than 4% of iron oxide content.
Dependence of the foaming coefficient on the initial temperature in the furnace* Тinitial, [оС] in the furnace Gassing agent, [wt. %] Foaming time, [min] Foaming coefficient (Kv) 27.5 silica, 0.5 30 1.5 100 silica, 0.5 30 1.61 200 silica, 0.5 30 1.75 300 silica, 0.5 30 1.88 * example from composition #2 Analyzing the data received, it can be concluded that when the initial temperature in the lab furnace increases, the foaming kinetics changes.
Analyzing the data received, it can be concluded that to obtain a foam material with the most equal porous structure, it is necessary to use a 25% NaOH solution as a foaming agent and to maintain the maximum foaming temperature in a lab furnace of 890°C.
Conclusion According to the experimental data, in order to obtain a lighter foam material it is necessary to have a SO3 content in the original glass composition of at least 0.3% with an iron oxide content of more than 4%.
Online since: September 2013
Authors: Hong Lei Liu, Jian She Ma
The slave which was used to receive command from master was the key to cost the reduction.
We detect the data when command 1000000110000000111 was posted, the wave is shown in figure 7.
Fig. 7 Command detected by logical analyzer There are two methods when the slave receives the data, one is based on timer, while the other is based on the falling-edge interrupt.
We can read the timer count in external interrupt handling routine to get the time interval of two adjacent falling edge, coupling with bit_previous, the bus data can be read one by one.
The whole bus data can be received by bit_previous and the next two time interval between adjacent external interrupt.
We detect the data when command 1000000110000000111 was posted, the wave is shown in figure 7.
Fig. 7 Command detected by logical analyzer There are two methods when the slave receives the data, one is based on timer, while the other is based on the falling-edge interrupt.
We can read the timer count in external interrupt handling routine to get the time interval of two adjacent falling edge, coupling with bit_previous, the bus data can be read one by one.
The whole bus data can be received by bit_previous and the next two time interval between adjacent external interrupt.
Online since: December 2013
Authors: Yan Zhao, Hong Yu Jiang, Jie Gu, Ru Qin Wang
Axial Load
(MN)
Ratio of Compressive
Strength
Longitudinal Reinforcement
Horizontal Reinforcement
Configuration
Reinforcement Ratio
Diameter
(mm)
Spacing
(mm)
Volumetric
Ratio
S1
0.28
0.1
40 8
0.014
6
40
0.035
S2
0.56
0.2
40 8
0.014
6
40
0.035
2.2 Loading Devices and Loading Schemes
The Loading system is composed of vertical loading device, horizontal loading device, data acquisition system and control system.
British IMP data acquisition equipment was used in the data acquisition system acquisition.
The speed of data acquisition is 1 / 2S.
Initial displacement change in the unloading stage lagged far behind the reduction of load after the maximum horizontal load was reached, which shows obvious pinching phenomenon.
British IMP data acquisition equipment was used in the data acquisition system acquisition.
The speed of data acquisition is 1 / 2S.
Initial displacement change in the unloading stage lagged far behind the reduction of load after the maximum horizontal load was reached, which shows obvious pinching phenomenon.
Online since: February 2012
Authors: Kazem Reza-Kashyzadeh, Mohammad Jafar Ostad Ahmad Ghorabi
An elliptical crack in the middle of the plate
Elliptical crack progress features and part materials
Assuming the crack progress rate data is increasing regularly according to ∆k, the software works and it is activated by a high physical sensitivity.
Although crack progress data is increasing regularly, stress curve against crack life is decreasing regularly.
dadN=C∆Kn(1-RKc-∆K) (1) Where: c: (length stressdadN×(Kc-1) when time R=0 and ∆K=0 n: (dimensionless) in Paris equation when time ∆K=0 The only exception in standard state when R (stress ratio) is negative is the use of Forman equation which has great flexibility in controlling the indicated information of crack progress ratio. [3] The model is assumed as Aluminum sheets with different heat treatment by following mechanical properties in Table1 and see crack growth rate data for Aluminum Alloy in Figure 2.
Crack Growth of Crack data of Aluminum Alloy Calculation of intensity Stress Factor This problem, which is a classic one in the elastic theory, surely is not a simple problem.
Harter, AFGROW USERS GUIDE AND TECHNICAL MANUAL, Air Force Research Laboratory [4] Socie, D., 1980, Fatigue life for bluntly notched members, Journal of Engineering Materials and Technology, Transactions of ASME, Vol. 102 [5] Leis, B.N. and Topper, T.H., 1977, Long-life notch strength reduction due to local biaxial state of stress, Journal of Engineering Materials and Technology, Transactions of ASME, Vol. 99 [6] Crews, J.H,.
Although crack progress data is increasing regularly, stress curve against crack life is decreasing regularly.
dadN=C∆Kn(1-RKc-∆K) (1) Where: c: (length stressdadN×(Kc-1) when time R=0 and ∆K=0 n: (dimensionless) in Paris equation when time ∆K=0 The only exception in standard state when R (stress ratio) is negative is the use of Forman equation which has great flexibility in controlling the indicated information of crack progress ratio. [3] The model is assumed as Aluminum sheets with different heat treatment by following mechanical properties in Table1 and see crack growth rate data for Aluminum Alloy in Figure 2.
Crack Growth of Crack data of Aluminum Alloy Calculation of intensity Stress Factor This problem, which is a classic one in the elastic theory, surely is not a simple problem.
Harter, AFGROW USERS GUIDE AND TECHNICAL MANUAL, Air Force Research Laboratory [4] Socie, D., 1980, Fatigue life for bluntly notched members, Journal of Engineering Materials and Technology, Transactions of ASME, Vol. 102 [5] Leis, B.N. and Topper, T.H., 1977, Long-life notch strength reduction due to local biaxial state of stress, Journal of Engineering Materials and Technology, Transactions of ASME, Vol. 99 [6] Crews, J.H,.
Online since: June 2009
Authors: Wiesław M. Ostachowicz, Pawel Kudela, Arkadiusz Zak
However, inverse techniques are computationally
intensive and operate on huge amounts of data.
Knowing that attenuation of A0 mode in such composite material is very strong (about 85% reduction of amplitude is observed over a distance of 0.4 m for the excitation frequency 120 kHz) let us use 20 piezoelectric transducers.
Normalisation helps to generalise amplitude levels for different types of data.
This procedure gives averaging data samples or rather moving averaging data because of using windowed signal.
Knowing that attenuation of A0 mode in such composite material is very strong (about 85% reduction of amplitude is observed over a distance of 0.4 m for the excitation frequency 120 kHz) let us use 20 piezoelectric transducers.
Normalisation helps to generalise amplitude levels for different types of data.
This procedure gives averaging data samples or rather moving averaging data because of using windowed signal.
Online since: September 2007
Authors: Alessandro de Stefano, Donato Sabia, Roberto Spadavecchia
Only the strictly necessary data concerning the structure and the test are
reported.
The main advantage in applying the test is the reduction of computational time since there is the possibility of choosing the best data set, i.e., the one that has the minimum ERC.
Furthermore, said best data set presents the minimum distance from the theoretical (a) (b) (c) (d) (e) (f) Fig. 1: ERC with different percentage of noise Fig. 2: Bridge over the Tanaro river: ERC related to some measures hypotheses and minimizes the uncertainties associated to the results.
If none of the data sets presents a smooth ERC, then the methods cannot be applied.
The main advantage in applying the test is the reduction of computational time since there is the possibility of choosing the best data set, i.e., the one that has the minimum ERC.
Furthermore, said best data set presents the minimum distance from the theoretical (a) (b) (c) (d) (e) (f) Fig. 1: ERC with different percentage of noise Fig. 2: Bridge over the Tanaro river: ERC related to some measures hypotheses and minimizes the uncertainties associated to the results.
If none of the data sets presents a smooth ERC, then the methods cannot be applied.
Online since: October 2011
Authors: Kuo Hsiung Tseng, Yong Fong Shiao, Yu Ting Yeh
Figure 1 Microwave-based heating device and measuring equipment
Figure 2 Taguchi method flow
After the optimal heating conditions were determined, the experiment was performed, and input power and output (temperature) data were recorded.
The orthogonal arrays planning and the experimental data of L9(33) experiment are as listed in Table 2.
The influence of the factors on the system can be calculated using the data in Table 2 to create the response table.
Pretreatment of biomass material in steam explosion: (1) The data are recorded after experimentation.
Conclusions Due to the energy crisis and the policy of energy savings and carbon reduction, microwave-based heating is the future trend.
The orthogonal arrays planning and the experimental data of L9(33) experiment are as listed in Table 2.
The influence of the factors on the system can be calculated using the data in Table 2 to create the response table.
Pretreatment of biomass material in steam explosion: (1) The data are recorded after experimentation.
Conclusions Due to the energy crisis and the policy of energy savings and carbon reduction, microwave-based heating is the future trend.
Online since: October 2011
Authors: Mahmoud Azami, Sasan Jalilifiroozinezhad, Masoud Mozafari
The present study was aimed at preparing biphasic CF/FHAp solid solution through a continuous precipitation method especially for dental applications, which could be used not only as an osteoconductive material due to the nature of FHAp but also, as a labile F- reservoir for developing potentially more effective F- regimens and as an agent for use in the reduction of dentin permeability and dental caries prevention.
Crystallographic identification of the phases of synthesized powder was accomplished by comparing the experimental XRD patterns to standards compiled by the International Center for Diffraction Data (ICDD), which was card #09-0432 for HA, #15-0876 for FA and # 77-2096 for CaF2.
The average size of the individual crystallites was calculated from XRD data using the Scherrer approximation (Eq. 1): (1) where t is the crystallite size, λ is the wavelength of Cu-Kα radiation (1.540560 Å) and β1/2 is full width at half maximum intensity.
Since, Ca and F exist either in FHAp and CF, mathematical equations were drawn based on the data shown in table 2, to evaluate the percentage of each compound in the final precipitate.
Dowker, Apatite Structure, JCPDS-International Centre for Diffraction Data, Advances in X-ray Analysis.45 (2002) 172-181
Crystallographic identification of the phases of synthesized powder was accomplished by comparing the experimental XRD patterns to standards compiled by the International Center for Diffraction Data (ICDD), which was card #09-0432 for HA, #15-0876 for FA and # 77-2096 for CaF2.
The average size of the individual crystallites was calculated from XRD data using the Scherrer approximation (Eq. 1): (1) where t is the crystallite size, λ is the wavelength of Cu-Kα radiation (1.540560 Å) and β1/2 is full width at half maximum intensity.
Since, Ca and F exist either in FHAp and CF, mathematical equations were drawn based on the data shown in table 2, to evaluate the percentage of each compound in the final precipitate.
Dowker, Apatite Structure, JCPDS-International Centre for Diffraction Data, Advances in X-ray Analysis.45 (2002) 172-181