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Online since: November 2012
Authors: De Guang Shang, Tao Chen, Chong Gang Ren, Lu Wang, Xiao Dong Liu, Hong Chen, Chang Gang Nai
Results and Discussion Fatigue Properties of Original Notched Specimen The S-N curve of the original specimens was obtained from fatigue test data, as shown in Fig.2.
From the experimental data, a definite optimal region at pulse number of 1 to 3 for different energy densities by laser irradiation can be found.
From the experimental data, the total fatigue life with the same laser parameters has a less improvement than the damaged specimen for the chosen laser optimum parameters.
It can be seen that the surface shows a large number of molten particles of the material, which leads to reduction in the fatigue resistance.
From the experimental data, the total fatigue life of the damaged specimen with this set of laser parameters is lower than that of the original specimen.
Online since: May 2011
Authors: Li Bo Qin, Kui Li, Bin Jia, Jun Lin Tao
From table 1, when temperature is 300°C, compared with the strength of normal temperature, the compressive strength is declined slightly, and strength reduction factor is 0.96.
Base on the experimental data and through fitting, expression of high temperature compressive strength and room temperature strength with temperature T are obtained
From the figures, although only three temperature groups of data are taken to fit, but the theoretical expression for all temperature values are agreed well with experimental values, which can describe the change of concrete compressive strength and the peak strain with temperature.
Base on the acquired experimental data, the expression of peak strain with temperature, see equation (2).
And according to experimental data and the constitutive model is extended to different temperature.
Online since: January 2013
Authors: Kun Zhang, Hai Feng Wang, Sheng Pei Dai
Historical Development The description of The earliest reports on the electronic nose: Objective needs of the industry, The development of sensor technology and oxidation - reduction reaction on the electrode analog electronic olfactory process, 1960s, Buck et al achieve a gas measurement by Using changes in the conductance of a metal and a semiconductor, Dravieks measured. the gas Based on changes in contact potential.
Causing changes in the conductivity of the sensor, then be calculated by the computer data system.
Its principle is to quickly identify a single compound or mixture of gases after practice that is made up by several parts like Sensor array, sampling and cleaning channel, adsorption desorption unit, the data acquisition system and the computer. but Its wide range of application areas is not enough, it is not get further popularize use, The main reason is that its size is too large and the prices are high.
And other tropical agricultural and sideline products quality recognition experiments, after specific experimental process, Achieve a certain probability of experimental data, get experimental results, To draw overall conclusions and programs.
Through the software of data processing, use mango, banana, papaya and other tropical agricultural products as experimental subjects to have Quality testing laboratory.
Online since: August 2021
Authors: Sergey B. Sapozhnikov, Egor V. Leshkov, Oleg A. Kudryavtsev
The analytically predicted number of cycles before failure showed a good agreement with experimental data.
This approach allows taking into account the reduction of composite stiffness due to microdamage accumulation.
The maxima envelope functions on the “displacement-time” diagrams were obtained to compare calculation data and experimental results.
L-N curves (M = 0.000289, s = 1.5) The biggest discrepancy between calculated data and experiments was observed at lower load levels.
Nevertheless, the experimental data analysis showed the necessity of taking into account additional nonlinear deformation mechanisms: machine stiffness, contact interactions, delamination, intra-, and interlaminar shear.
Online since: January 2014
Authors: Bao Tian Wang, Xu Fen Zhu, Yong Li Zhang, Jun Yang Wei
Table 1 Basic parameters of clay Clay parameters /(g∙cm-3) /% /% 1.23 33.3 22.8 10 -1.3 Table 2 Basic parameters of ecological bag and grille Test material Coefficient of variation/% Average tensile strength/(kN∙m-1) Warp knitted geogrid 6.9 54.9 Geonet 3.4 14.5 Test instruments and operating procedures There exists large mesh between geogrid strips, the test data result from direct shear test show that the friction strength characteristics between clay covers a great part.
It applied vertical load with lever, and horizontal load with strain control which use stepper motor to drive reduction gear.
Data acquisition system.
Data acquisition system consists of pull and pressure sensor, displacement sensor, data acquisition device, microcomputer etc.
Online since: December 2012
Authors: Pawan Kumar Arora, Abid Haleem, M.K. Singh, Harish Kumar
Murugan (2005) proposed new approaches for cell formation which takes into account the relevant production data such as process sequences and set–up times.
A genetic algorithm has been developed for solving the cell formation problem considering the reduction in set up time.
Tests using published data show that the proposed algorithm can find the group structure present in the data sets.
The main objective behind this algorithm is to explain an application of the vision system that uses upstream design data of machined parts of different types for downstream metrology and quality decision making in the environment of flexible manufacturing.
Online since: November 2013
Authors: Alireza Hajizadeh, Ahmad Reza Bahramian, Alireza Sharif
Consequently their mercury porosimetry data must be analyzed by the buckling Eq. (2).
Textural characterization of sample( PN2 PN1 PN0.5 ) a) Mercury porosimetry raw data, volume versus pressure and (b) relative pore volume as a function of pore size Toughness improvement via rubber toughening was achieved by the formation of rubber domains, which delay and/or decrease the growth rate of main and secondary cracks propagating in the stiff but brittle phenolic matrix.
The samples submitted to mercury porosimetry show an unusual behavior; in a large pressure range, the recorded volume variation corresponds to a bulk volume reduction of the sample, and not to an intrusion of mercury into the pore network.
The usual method for analyzing mercury porosimetry data assumes that mercury intrudes the pore network, and is not appropriate in the present case.
A new method was developed to analyze the data of porous materials using Eq. (2), which is based on a model of buckling of the structure.
Online since: November 2014
Authors: Peng Ran Zhao, Cui Zhang, Ke Ming Wang
Number of Cross section Description of Cross section position Description of measuring point and direction Section 1-1 Through front bearing of the fan 2 front points in horizontal and vertical directions Section 2-2 Through the intermediate casing 2 middle points in horizontal and vertical directions Section 3-3 Through the bearing of the low pressure turbine 2 rear points in horizontal and vertical directions Section 4-4 Through external accessory unit 2 outer points in horizontal and vertical directions Section 5-5 Through gear reduction unit 1 upper point in horizontal direction After selecting the locations of the measuring points, the different operating conditions of aircraft engine are tested and the vibration signals are measured.
[2] Wu Qishi, Nafeswara S.V., On computing Mobile Agent Routes for Data Fusion in Distributed Sensor Networks, IEEE Transactions on Knowledge & Data Engineering, Jun.2004 [3] AI Yan-ting,FEI Cheng-wei.
Multi-sensor Data Fusion and Its Application [M].
Sensor and Data Fusion Concepts and Applications [M] DAI Ya-ping, LIU Zheng, YU Guang-hui, tranlated.
Online since: February 2013
Authors: Gui Juan Dong
The concept of ecological compensation by ecology theory derivation, show natural ecological compensation, which is defined as organisms, population, community or ecological system interference, shown by the moderate interference, adjust their own state make survival to the maintenance ability, or can be regarded as ecological load reduction ability[2].
In the national library of China library data, in the field of ecological compensation, the publication of the book publication, press year classification statistics: 2011 article 9, 2010, article 17, 2009 7, 2008 article 10, article May 2007, 2006 article 4, 2005 1, 2004 1, 2003 article 2, 2002 article 2, 2000 1, 1994 article 2.
Figure 2 Ecological compensation in recent years the books and publications and degree paper presented quantity statistics Based on the Ecological Compensation of Journal Articles Academic Research Statistics To know China and lager all sink scholarly literature as the source database, select relevant keywords, literature retrieval results obtained with EXCEL for data processing tools, using literature metrological methods on the above database collected papers from the research content structure, research institutions, research field and get funding research on statistics.
So the retrieval data the same research content classification, compound term retrieval results to less than the sum of individual term results, it shows that there are repeated part.
Through the data in table 1, get field of ecological compensation in 2000-2011 by the trend of the development of funded papers (figure 4).
Online since: February 2012
Authors: Lin Jing Xiao, Hui Sun, Chun Jian Su
Firstly, the biological prototype is researched to get some useful data which are simplified to obtain the living model.
The driving drum is driven by the reduction electromotor and the loading drum is connected with the magnetic power brake to load.
The pressure sensors are connected with the transmitters and data acquisition card to output the signal to the computer. 1 2 4 3 5 6 7 V PH T 8 9 1 2 3 4 5 6 7 8 9 1-Driving drum;2-Tension measuring part at the meeting point;3-Slipping detector;4-Loading drum;5-Turnabout drum;6-Tail drum;7-Tension measuring part at the leaving point;8-Pressure sensor;9-Belt.
In view of the measurement error and the change of the wrapping angle in action, the measuring data are processed to obtain the practical friction coefficient as shown in Table 1.
(4) From the measuring data, the bionic driving drums designed all have the increasing friction effect which relates to the shape,size and arrangement way of the convex hulls.
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