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Online since: October 2014
Authors: Hua Yu
The experimental data shows that the method effectively reduces the measurement error of one reference signal cycle in the measurement of time interval.
The Realization Principle The measurement device includes two groups of compensation circuit, a counter, two compensation circuit number latch circuit, logic control unit, data processing circuit and a measurement display circuit and other parts.
Fig. 2 Structure diagram of the short time interval measurement equipment The data processor measures the time interval according to the counter value and latch serial of two latches.
(8) Formula (7) reduction formula (8) we can get:
Experiments and Results Analysis In the course of the experiment, the counting circuit, logic control circuit, data processing is achieved by the FPGA chip EP2C5Q204.
Online since: March 2014
Authors: John M. Cookson, Peter J. Mutton
Examples of loading spectra for coupler forces and track loads are presented, along with data from past investigations showing the severe penalty in terms of fatigue life caused by inadequate surface finish at critical locations of components under fatigue loads.
Data from a major railway indicates that loads up to 2500kN tensile and 3000kN compression are possible during service.  
The ultimate tensile strength of the cast steel components are in the range of 850-1000MPa, so the reduction in fatigue strength due to decarburization is substantial.
The nominal coupler force of 1000kN translates to a stress on the overall section of the yoke in Figure 2 of around 120MPa; under the more unusual loads of 2000kN, this becomes 240MPa, which is at the fatigue limit for decarburized steel at this strength range according to the data in Figure 6.
These data are therefore well aligned with the field experience of draft components.
Online since: September 2013
Authors: Nadia Adrus, Mathias Ulbricht
Interestingly, the mesh size rubbery hydrogels determined from rheological data was in a good agreement to that from swelling experiments (~ 4 to 9 nm).
The mesh size of PNIPAAm hydrogels from rheology data was calculated using Eq. 2.
The mesh size was also calculated from swelling data using Eq. 3.
Data also shows that the PNIPAAm hydrogels in this case exhibited LCST in the range which is in agreement with findings of others [7].
This can be due to the fact that high content of monomer or crosslinker increased the compactness of the hydrogel network and resulted in a mesh size reduction (c.f.
Online since: October 2011
Authors: Hai Min Su, Gang Fang, Jian Yong Chen, Qiang Zhao, Juan Yang
The article takes 2 TM images as the data source, supported by the Fragstats 3.3 and the ENVI 4.7 softwares, two remote sensing images are classified by the support vector machine method, selects the number of patches (NP), edge density (ED), patches density (PD), landscape shape index (LSI), perimeter area fractal dimension (PAFRAC), interspersion juxtaposition index (IJI), patch cohesion index (COHESION), Shannon's diversity index (SHDI), Shannon's evenness index (SHEI) and contagion index (CONTAG), using the landscape ecological principles and methods, analyzes the dynamic changes of Dangshan landscape patter in 1987-2009, with a view to Dangshan county land resources of reasonable planning and using, management, sustainable utilization, and the landscape pattern optimization configuration, provides the theory foundation and scientific basis.
Data Source and Methods Data Source.In this paper, using Landsat TM (track No. 122-36) two-phase (19870919; 20090408) TM images as the data source, weather conditions were no clouds.
As can be seen from Table 5, between 1987 -2009, the SHDI and SHEI of the overall landscape in Dangshan County have some degree reduction, the landscape heterogeneity also reduced, the degree of landscape control by a few classes landscape elements has enhanced, from the landscape contagion index changes in view, CONTAG increase suggests that the connectivity of the original superiority plaques is enhanced. the superiority plaques area increased, is divided small by the other landscape types.
Online since: October 2014
Authors: Chia Hung Lin, Shih Chieh Hsieh, Cheng Ta Tsai, Cheng Ting Hsu, Chao Shun Chen
The historical data of solar irradiation over one year period are collected to derive the annual duration curve of solar energy to derive the probabilistic distribution of PV power generation.
However, on-site PV power generation has various advantages such as the reduction of system power loss, investment deferral of power generation, transmission and distribution systems.
This study uses the data of solar irradiation levels over one year period to derive the distribution model of PV power generation.
Collect the hourly solar irradiation of the study area over one year period Derive the annual irradiation duration curve by sorting the hourly irradiation data Execute load forecasting of distribution substation and derive its daily peak load variation curve Calculate the probabilistic distribution of PV generation within the study area Solve the loss of load expectation (LOLE) within the substation service area LOLE < 0.1 days/yr?
Probability Distribution of PV Power Generation The annual duration curve of solar irradiation is derived by sorting the hourly irradiation data in descending order.
Online since: September 2013
Authors: Wei Wei Wang, Jing Li, Yuan Yuan Guo, Xin Chun Liu
With the quick development of information science, it becomes much harder to deal with a large scale of data.
§ Shared Storage Unit It stores users’ batch jobs, all kinds of data needed by the jobs, intermediate results, output, etc.
The work is supported by the National Science and Technology Supported Program "National Financial Data Analysis and the Key Technologies and Applications of Information Service Based on Cloud Computing (2012BAH17B03)" and USTC-Lenovo Cloud Computing Laboratory.
“eScience in the Cloud: A MODIS Satellite Data Reprojection and Reduction Pipeline in Windows Azure Platform”.
Online since: November 2012
Authors: Feng Wei, Wei Long Liu, Yi Heng Lu
Non-isothermal kinetic data of the membrane were analyzed by using the thermo-gravimetry analysis and the Kissinger, Flynn-Wall-Ozawa and Friedman methods under the conditions of flowing gas nitrogen and the heating rate of 5, 10 and 20˚C /min.
Based on our research about the thermal stability of PEM[5], by means of the TGA technique, we investigated the thermal decomposition kinetics after PEM reacted with Fenton's reagent, The thermal decomposition kinetic data were analyzed by using the Kissinger, Flynn-Wall-Ozawa and Friedman techniques.
When PEM is attacked by higher reactive oxygen free radicals (• OH, • OOH) produced from the electrochemical or chemical reaction of hydrogen and oxygen in the presence of platinum catalysts, hydrogen peroxide is generated from the two-electron oxygen in the cathode reduction, see reaction (a); The oxygen molecules penetrated into the membrane from the cathode to the anode, see reaction (b), (c) and (d); When hydrogen and oxygen exist in the PEM fuel cell membrane, hydrogen peroxide is detected obviously through in situ testing techniques; The hydrogen peroxide is cleavage chemically to the hydroxyl radical assisted by the metal ions such as Fe2+ existing in the membrane.
ln [dα / f (α) dT] = ln (A /β) -E/RT (5) ln [g (α) / T2] = ln (AR / βE) -E/RT (6) Experimental data α, T, dα/dT, respectively, are substituted into the differential equation (5) and integral equation(6), when the linear correlation coefficient is better and the standard deviation is smaller Table 2.
Online since: November 2015
Authors: Mieczysław Poniewski, Sławomir Alabrudziński, Mirosław Grabowski, Krzysztof Płaczkowski
The data, in the form of the footage of two-phase flow structures, were subjected to the analysis with the scripts, developed for that purpose in the MathWorks Matlab 2010b environment.
Llb,i = length of the elongated, partially visible bubble (cylinder plus one hemisphere) Cylinder volume: Vc,i=Llb,i-a2πa24 (10) Vlb,i = cylinder volume + hemisphere volume Volume of the elongated bubble (cylinder + hemisphere): Vlb,i= Llb,i-a2πa24+ πa312= πa24 (Llb,i- a6) (11) Void fraction for the large, partially visible bubble is: φlb,i= πa24 (Llb,i- a6)La2= π(Llb,i-a6 )4L (12) Void fraction for large, partially visible bubbles is: φlb= π4Li(Llb,i-a6 ) (13) Measurement Data Analysis Mathworks Matlab 2010b software together with the tool sets, namely Computer System Vision Toolbox and Image Processing Toolbox were used to conduct the photographic analysis of the video footage.
The other set makes it possible to do imaging tasks at the level of individual frames, such as image analysis, object segmentation, image sharpening, noise reduction, geometric transformations, etc.
On the basis of the data and with the use of equations, void fraction in the w mini-channel was calculated.
Online since: March 2024
Authors: Adel Khalid Alfozan
The outcomes of each test have been compared with the data taken without heat treatment, so the ductility increase can be observed.
All of this data was needed to study the changed behavior of magnesium alloys.
It can be seen that furnace cooling gives less reduction in the strength as compared to water quenched specimens.
In order to see how ductility increased, results from each test were compared to data collected without heat treatment.
Online since: October 2014
Authors: Rui Jia, Xue Qian Wang, Xiao Long Guo, Lang Lang Wang, Yong Shi, Ping Ning
The experimental data fitted with the prediction model very well and the model may be a worthy reference for the catalytic oxidation process of HCN.
Combined with the existing literature and the experimental data, the kinetics of catalytic oxidation of HCN were discussed.
Fig. 1 The effect of space velocity on catalyst activity Based on Fig1, the conversion rate of HCN decreased rapidly, when the airspeed is higher than 6000 h-1, owning to the contact time reduction between the gas mixture and the catalyst, but the removal rate of HCN is obtained 98%, when the velocity is less than 6000 h-1, proving the results of catalytic reaction are approving.
(1) As former discussed, the reasonable reaction temperature was controlled at 150-250 ℃, To make the concentration of HCN enter into the isothermal tubular reactor was 200 mg/m3, change the space velocity (Q/V) to investigate the anastomotic degree of conversion rate of HCN that predicted values by type 1 and real experimental data.
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