Sort by:
Publication Type:
Open access:
Publication Date:
Periodicals:
Search results
Research of Wireless Sensor Network Node Based on Vibrating Wire Sensor of Single Coil and Phototube
Online since: January 2011
Authors: Xue Zeng Zhao, Da Yong Li
It can complete many works, such as data acquisition and processing, communication protocol and control of the node, etc.
In the RF circuit(as Fig.3 below), two inductances are in series and connect to a balun LDB2120402C-001 which can support the better bandwidth and the less performance reduction.
In order to assure data be transmitted correctly, the frames are sent in CSMA-CA mode, and the answer signal is adopted. 4 Conclusions Conventional vibrating wire sensor should be use together with frequency meter, and such system has the feature of high accuracy.
In the RF circuit(as Fig.3 below), two inductances are in series and connect to a balun LDB2120402C-001 which can support the better bandwidth and the less performance reduction.
In order to assure data be transmitted correctly, the frames are sent in CSMA-CA mode, and the answer signal is adopted. 4 Conclusions Conventional vibrating wire sensor should be use together with frequency meter, and such system has the feature of high accuracy.
Online since: May 2011
Authors: Feng Miao, Guan Ping, Wang Bo
For this calculation model, it can be got by calculating with geological data and the design drawings:
Taken the pile cap bottom as maximum scour line, l0=0m, elastic modulus of concrete , auxiliary pier pile base:; pylon pile foundation:, put the data into the formula 1, it can be obtained respectively: embedded depth of auxiliary pier pile H=5.44m; embedded depth of main tower pile H=11.76m, both in the range of 3 to 5 times of the diameter, while modeling take embedded depth of auxiliary pier pile H=6m; embedded depth of main tower pile H=12m.
Conclusion Through analysis self-anchored cable-stayed suspension bridge of two calculation modes between consolidation bottom of tower and considering pile-soil-structure interaction, we can obtained the following conclusions: (1) The integral rigidity of structure could be reduced and natural vibration period be extended by pile-soil-structure interaction which has the most influence to the first period; (2) Because of reduction of integral rigidity of structure, while longitudinal seismic inputting, longitudinal displacement of middle main span and main tower top increase obviously; the bending moment at tower bottom and pier bottom both decrease significantly, a 47% decreasing amplitude.
Conclusion Through analysis self-anchored cable-stayed suspension bridge of two calculation modes between consolidation bottom of tower and considering pile-soil-structure interaction, we can obtained the following conclusions: (1) The integral rigidity of structure could be reduced and natural vibration period be extended by pile-soil-structure interaction which has the most influence to the first period; (2) Because of reduction of integral rigidity of structure, while longitudinal seismic inputting, longitudinal displacement of middle main span and main tower top increase obviously; the bending moment at tower bottom and pier bottom both decrease significantly, a 47% decreasing amplitude.
Online since: November 2011
Authors: Yu Xin Yao
The mathematical model is established, combined with theoretical analysis and observational data.
Experimental data shows the fractal dimension of the crack increases with the increasing number of stress cycles initially, and decreases gradually as it reaches a certain value.
Due to bending and the reduction of the degree of its change, the covering dimension decreases.
Experimental data shows the fractal dimension of the crack increases with the increasing number of stress cycles initially, and decreases gradually as it reaches a certain value.
Due to bending and the reduction of the degree of its change, the covering dimension decreases.
Online since: November 2012
Authors: Yong Mei Guo, Wei Chen
The DSR data of asphalt binders, obtained by means of frequency sweeps at different temperatures under linear viscoelastic conditions, were horizontally shifted to form master curves at the selected reference temperature by using the TTSP.
The rheological changes for the base asphalt (#1) following RTFO aging as seen in Fig. 2 display an increase in complex modulus and a reduction in phase angle.
Conclusions Frequency sweep data from DSR testing over a wider range of frequencies were horizontally shifted to construct master curves of complex modulus and phase angle for SBS modified asphalts and base asphalt by means of the TTSP.
The rheological changes for the base asphalt (#1) following RTFO aging as seen in Fig. 2 display an increase in complex modulus and a reduction in phase angle.
Conclusions Frequency sweep data from DSR testing over a wider range of frequencies were horizontally shifted to construct master curves of complex modulus and phase angle for SBS modified asphalts and base asphalt by means of the TTSP.
Online since: July 2014
Authors: Hui Ling Li, Xin Rui Gao, Ji Yong Xie
The supervisor establishes supervision executive detailed rules according to laws and regulations relevant to the country, ordinances, project contract documents and technological data.
It need to examine approaching materials, and deeply understanding management goals of all kinds of nodes in the green construction, at the same time, recording, collecting and clearing up the information data, in order to formulate relative measures of organization, management and technology.
In the process of construction, supply chain is throughout, and it is one of the significant ways implement energy saving and emission reduction in the process of green construction.
It need to examine approaching materials, and deeply understanding management goals of all kinds of nodes in the green construction, at the same time, recording, collecting and clearing up the information data, in order to formulate relative measures of organization, management and technology.
In the process of construction, supply chain is throughout, and it is one of the significant ways implement energy saving and emission reduction in the process of green construction.
Online since: December 2010
Authors: Guo Qiang Chen, Jian Li Kang
As shown in Fig.3, Persistent variable and Data store Memory block in MATLAB/Simulink /Signal Routing can be used.
Reduction of audible switching noise in induction motor drives using random position space vector PWM, IEE Proceedings: Electric Power Applications, May 2002, Vol.149, No.3, pp.195-200 [2] Yin Zhong-Gang, Zhong Yan-Ru, Liu Jing and Zhu Quan-Bing.
Principle and realization for generating data sequence with errors, Journal of Henan Polytechnic University(Natural Science), October 2008, Vol.27, No.5, pp.560-564
Reduction of audible switching noise in induction motor drives using random position space vector PWM, IEE Proceedings: Electric Power Applications, May 2002, Vol.149, No.3, pp.195-200 [2] Yin Zhong-Gang, Zhong Yan-Ru, Liu Jing and Zhu Quan-Bing.
Principle and realization for generating data sequence with errors, Journal of Henan Polytechnic University(Natural Science), October 2008, Vol.27, No.5, pp.560-564
Online since: August 2013
Authors: Cheng Zhu Qiu, Gang Yang
Under the high temperature, The compressive capacity, flexural capacity of the concrete column strengthened with different thicknesses CFRP is analysed, and the influence of different cross-section shape is also analysed. so the analytical data and conclusions about the high temperature bearing capacity of concrete column strengthened with CFRP are obtained.
1 Performance of Materials
1.1 High temperature performance of steel reinforced concrete column
Under high temperature, the mechanical property of the materials that constitute concrete column degrades as temperature rising[2]. ①concrete: The stress-strain curve of concrete becomes more flat and the summit descends and move right evidently with the rising of temperature, it indicates compression strength degrades, the strain peak amplifies rapidly and the elastic modulus reduces significantly, as is shown in Fig 1; ②reinforced bar: the elastic modulus and the proportional limit of reinforced bar gradually declines with the rising
Tab1 The reduction ratio of bucking strength, proportional limit and elastic modulus of steel bar under high temperature T(℃) 20 100 200 300 400 500 600 fyT/ fy 1.000 1.000 1.000 1.000 1.000 0.780 0.470 fpT/ fp 1.00 1.000 0.807 0.613 0.420 0.360 0.180 ET/E 1.00 1.000 0.900 0.800 0.700 0.600 0.310 Fig.1 Gragh on the strain-stress of compressive Fig.2 Bearing capacity of axial compressive concrete under high temperature pile heated on three surfaces 1.2 High temperature property of CFRP CFRP(CF-1) has excellent mechanical properties, it has a high melting point, a high elastic modulus and a good high temperature strength(as is shown in Fig3), in addition, CFRP has a low coefficient of expansion, a good heat stability and can be wrapped on different members or structures, and CFRP can not influence the appearance of structure or increase the size of structure[3].
To keep section areas of two columns equal, the size of rectangular cross section was 200mmx200mm, and the diameter size of circular cross section was 220mm, the thickness of CFRP was 0.334mm, the height of concrete columns were 600mm. then the load was imposed under high temperature, the data was presented in Fig5.
Tab1 The reduction ratio of bucking strength, proportional limit and elastic modulus of steel bar under high temperature T(℃) 20 100 200 300 400 500 600 fyT/ fy 1.000 1.000 1.000 1.000 1.000 0.780 0.470 fpT/ fp 1.00 1.000 0.807 0.613 0.420 0.360 0.180 ET/E 1.00 1.000 0.900 0.800 0.700 0.600 0.310 Fig.1 Gragh on the strain-stress of compressive Fig.2 Bearing capacity of axial compressive concrete under high temperature pile heated on three surfaces 1.2 High temperature property of CFRP CFRP(CF-1) has excellent mechanical properties, it has a high melting point, a high elastic modulus and a good high temperature strength(as is shown in Fig3), in addition, CFRP has a low coefficient of expansion, a good heat stability and can be wrapped on different members or structures, and CFRP can not influence the appearance of structure or increase the size of structure[3].
To keep section areas of two columns equal, the size of rectangular cross section was 200mmx200mm, and the diameter size of circular cross section was 220mm, the thickness of CFRP was 0.334mm, the height of concrete columns were 600mm. then the load was imposed under high temperature, the data was presented in Fig5.
Online since: July 2014
Authors: Gian Bhushan, Pravin Kumar, S.K. Nayak, Anil M. Datar
Both the data are matching with in limited errors.
Figure 4: Plot of (a) 1st mode (b) 2nd mode (c) 3rd mode frequency with barrel recoil length Table 3: Theoretical and numerical data of different mode frequency with barrel recoil length 1st Mode frequency 2nd Mode frequency 3rd Mode frequency Recoil Length [m] Theoretical fn [Hz] FEM fo [Hz] % error Theoretical fn [Hz] FEM fo [Hz] % error Theoretical fn [Hz] FEM fo [Hz] % error 0 7.72 7.66 0.72 48.4 47.33 2.19 135 129.58 4.01 0.2 8.33 8.27 0.66 52.2 51.05 2.19 146 139.52 4.43 0.4 9.01 8.94 0.66 56.5 55.14 2.39 158 150.44 4.78 0.6 9.78 9.71 0.70 61.3 59.75 2.52 172 162.67 5.42 0.8 10.7 10.57 1.18 66.8 64.95 2.76 187 176.43 5.65 1 11.7 11.55 1.23 73 70.86 2.92 205 191.98 6.35 Analysis & Observation There is a close agreement between the theoretical prediction and numerical evaluation using FEM for the modal response of the gun barrel.
This is due to the reduction in the length of vibrating part of the gun barrel.
Figure 4: Plot of (a) 1st mode (b) 2nd mode (c) 3rd mode frequency with barrel recoil length Table 3: Theoretical and numerical data of different mode frequency with barrel recoil length 1st Mode frequency 2nd Mode frequency 3rd Mode frequency Recoil Length [m] Theoretical fn [Hz] FEM fo [Hz] % error Theoretical fn [Hz] FEM fo [Hz] % error Theoretical fn [Hz] FEM fo [Hz] % error 0 7.72 7.66 0.72 48.4 47.33 2.19 135 129.58 4.01 0.2 8.33 8.27 0.66 52.2 51.05 2.19 146 139.52 4.43 0.4 9.01 8.94 0.66 56.5 55.14 2.39 158 150.44 4.78 0.6 9.78 9.71 0.70 61.3 59.75 2.52 172 162.67 5.42 0.8 10.7 10.57 1.18 66.8 64.95 2.76 187 176.43 5.65 1 11.7 11.55 1.23 73 70.86 2.92 205 191.98 6.35 Analysis & Observation There is a close agreement between the theoretical prediction and numerical evaluation using FEM for the modal response of the gun barrel.
This is due to the reduction in the length of vibrating part of the gun barrel.
Online since: September 2014
Authors: Andrej V. Deineka, Sergej M. Vereshchaka
According to the passport data of the elastic, shear modulus and Poisson's ratio of carbon fiber LU-03 respectively 235000MPa, 90400MPa and 0.3.
Notes it`s the changing nature of the distribution of the axial and shear stress in seals, and reduction in the magnitude of maximum data values of stress by 30%. 4.
Notes it`s the changing nature of the distribution of the axial and shear stress in seals, and reduction in the magnitude of maximum data values of stress by 30%. 4.
Online since: July 2014
Authors: Ying Min Yan, Su Min Yang, Kai Wang, Zhi Ying Xie
After pretreatment on the original data, we get the decision table shown in Table 1
The below is the processing in accordance with the algorithm of section 3:
We consider Table 1 as an information system,,
.
The experts set experience factor in considering of objective data, the comprehensive weight depending on the formula (11) is obtained as follows: Table 2 The attribute object weight attribute 4.3923 0 0.2875 1.5558 1.2683 0.242569 1.638385 0.336972 4.3923 0 0.2875 1.5199 1.2324 0.235703 1.700704 0.34979 4.3923 0 0.3810 1.5899 1.2089 0.231209 1.522989 0.313238 4.3923 0 0 1.5190 1.5190 0.290517 1.891573 0.389046 In the actual command and information system, the quality of wireless communication capacity plays a decisive role on the operational effectiveness of the whole system because of wireless communication is a large proportion of communication in the current battlefield.
Knowledge reduction algorithm based on mutual information [J],tsinghua science and technology,2007,47(S2):1903-1906.
The experts set experience factor in considering of objective data, the comprehensive weight depending on the formula (11) is obtained as follows: Table 2 The attribute object weight attribute 4.3923 0 0.2875 1.5558 1.2683 0.242569 1.638385 0.336972 4.3923 0 0.2875 1.5199 1.2324 0.235703 1.700704 0.34979 4.3923 0 0.3810 1.5899 1.2089 0.231209 1.522989 0.313238 4.3923 0 0 1.5190 1.5190 0.290517 1.891573 0.389046 In the actual command and information system, the quality of wireless communication capacity plays a decisive role on the operational effectiveness of the whole system because of wireless communication is a large proportion of communication in the current battlefield.
Knowledge reduction algorithm based on mutual information [J],tsinghua science and technology,2007,47(S2):1903-1906.