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Online since: December 2012
Authors: Wen Hui Zhang, Zhe Wang, Yi Gong, Xue Hong Wu, Yan Li Lu
It is divided into three parts: refrigeration and heat pump system, water circulating system, and data acquisition system.
Data acquisition system: measuring ranges of instruments with uncertainties are listed in Table 2 Thermocouples are placed over the pipe surfaces and pressure transducers immersed in the inlet and outlet of each component.
s model was obtained by best fitting the experimental data of a CO2 compressor from Danfoss is suitable for RP>2.
The vapour superheat introduced by the IHX, besides causing a reduction of the CO2 mass flow rate, also increases the ideal specific compression work.
Thus two contrary affect the compressor power consumption, the reduction of the mass flow rate and the increment of the specific compression work, which can reduce or increase its value.
Online since: August 2015
Authors: Bukhari Manshoor, Izzuddin Bin Zaman, Amir Khalid
This reduction indicates an ineffective stress transfer between the fiber and matrix.
The data obtained was transmissibility versus frequency generated by VSC software.
It was observed that when the base excitation increase from 1mm to 1.5mm or 0.1g to 0.15g, the resonance and attenuation frequencies were shift to the lower values as well as resonance peak but sometime fluctuating data was found.
(a) Displacement and (b) acceleration transmissibility for epoxy/PALF composites Table 1 tabulates the average damping ratio of epoxy/PALF composite measured from transmissibility test data.
Online since: July 2011
Authors: Ping Zong, Jun Qin
The feature of BEB is that the size of CW depends on the number of collisions met by sending data packets.
SUM(send[i]) is the sum of data packets sending by the nodes during the NO.i monitoring cycle. 3.
When a node fails to send data, BEB algorithm would double the CW for the next channel competition.
This parameter reflects the ability of the network data processing.
The greater the throughput is, the stronger the network data processing capability is.
Online since: February 2011
Authors: Hui Hui Wang, Chang Xu Ji, Dong Zhi Shan
Then we obtained the data about the varying passenger flow density changing along with time and place.
We selected 8 locations including from pedArea1 to pedArea8 collecting the simulation data.
The area of each pedArea is 6 m2 instead of the unit area for the preciseness of the data collected.
Then we obtained the simulation data in first 40 seconds that was shown in figure 4.
From the density data of the table 2 and the density variety curves of the figures 5 and figure 6 we know: 1) The row data in table 2 shows the density changes over time, reflected in figure 6.
Online since: May 2012
Authors: Shu Lin Dai, Yong Liang Lv
From home, outside the related data that appear most, arch dam accident due to abutment instability caused by.
Valley alluvial deposits is great thickness, according to borehole data of the site, valley central is the 25m ~ 33m, two side a bit thin is about 15m.
The left dam shoulder´s main geological characteristics of the structural plane detailed data are showed in the table below 2-2.
Calculation method uses the limit equilibrium method, according to the space problem to analysis the block stability, structural and mechanical parameters of rock mass,all the datas are in table, and the load combination is as follows: Mix 1(normal temperature drop):dam came force + slider weight + corresponding osmotic pressure; Mix 2( normal temperature ascending):dam came force + slider weight + corresponding osmotic pressure; Mix 3 ( dead water level temperature ascending):dam came force + slider weight + corresponding osmotic pressure; Mix 4 ( check temperature ascending):dam came force + slider weight + corresponding osmotic pressure and Seismic load; Mix 5 ( combined 1 drainage failure):dam came force + slider weight + corresponding penetration Earthquake stress + Seismic load.
The anti-slide safety coefficient calculation formula: In tpye: ——Arch axis force; ——Arch beam bottom end and the corresponding radial force; ——Beam bottom vertical force; ——Rock mass; ,——The side surface and the bottom surface are respectively the friction coefficient; ,——The side surface and the bottom surface are respectively the cohesion; θ——Slip plane and arch end radial angle; φ——Slope angle; δ——As the rupture surface of high dip angle; ——Slip length; ,——The side surface and the bottom surface are respectively the uplift pressure, uplift reduction coefficient for drainage; Normal working hours,αvalue 0.35;Drainage failure,αvalue 0.5.
Online since: January 2013
Authors: Li Min Dong, Jun Li Zhang, Ze Wu, Tao Jiang, Xian You Zhang
The lattice parameters (a and c) obtained from XRD data decreases with increase in cobalt content x.
The XRD pattern for pure Sr0.5Ba0.5Fe12O19 is in good agreement with JCPDS data (Cardno.51-1879).
Using the JCPDS data the peaks of the XRD pattern were indices for the hexagonal structure.
(a)Hysteresis loops(b)curves From Fig. 3(b), it is seen that the coercivity value decreases from 5478.8 to 2397.1 oe with increasing cobalt concentration (x=0.0 to 1.0) due to reduction in magneto crystalline anisotropy [11].
Online since: July 2021
Authors: Ihab Ragai, Tyler J. Grimm, Derek Shaffer
In addition to this advantage, FSW is also characterized as having a strengthening effect, which results from significant grain size reductions.
This reduction occurs due to the extreme straining of the material at relatively low temperatures [1].
This data presents ample evidence to the tool path's effectiveness in controlling the temperature profile during welding.
The data shown in this figure represents the average of a total of four samples taken at two different locations (two per location) along the weld, as described in the Methodology section.
No distinguishable trend could be realized from this data.
Online since: July 2012
Authors: Ifigeneia Antoniadou, K. Worden, G. Manson, W.J. Staszewski
Tooth damage causes a reduction in gear tooth stiffness, thus it can be modelled by reducing the stiffness function periodically, with the period of the gear with the damaged tooth.
The simulation of the time-varying loads, observed in wind turbines systems was done using FAST, AeroDyn and ADAMS codes, developed by National Renewable Energy Laboratories, and these gearbox torque data were inputted to the 2DOF gear model.
Concluding, the author suggests that other methods must be tested too for the cases described, and experimental data would prove really useful for the continuation of this study.
References [1] Wind Turbine Data Summary Table 2, WindStats Newsletter, 2007, 1, 20
Ball, "Gear tooth stiffness reduction measurement using modal analysis and its use in wear fault severity assessment of spur gears", NDT & E International, 2003, 36, 357-372
Online since: September 2013
Authors: Zhong Gen Xu, Chang Gen Deng, Kang Qin
Meanwhile, analysis of vibration types of transformation and rotation under seismic action is also carried out, in order to provide reference data for further elastic-plastic analysis.
However, the vibration of the structure often became the main reason of the engineering accident including damage of the structure, accuracy decreasing of a device or reduction of its reliability etc.
Online since: December 2010
Authors: R.S. Il’yasov, N.V. Fedorova
According to the Mössbauer spectroscopy data, they are related to the formation of a component of magnetic moments that is perpendicular to the ribbon surface.
The reduction of the Hmax in the finemet is explained by quenching of the relaxation stresses, leading to a decrease in the local magnetoelastic anisotropy.
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