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Online since: January 2017
Authors: Dong Wang, Chen Guang Wei
This article analyzed data of dynamic load test on several different types of PV modules, and got the conclusion that the dynamic load stress could harm the string ribbon or interior circuits of the PV modules, and would therefore lead to capacity reduction and less insulation.
Prior to and post the experiment, the data for insulated resistance and withstand voltage, wet leakage current, and maximum power were tested.
The data are follows (Graph 1) : Graph 1 Comparison of pre-experiment and post-experiment data on major performance of the PV module Conclusions After the dynamic mechanical experiment, only the dry insulation resistance of sample No. 010 grows, which might be resulted from poor seal ability of the module at the initial experiment.
The resistance performance and maximum power of all other samples decrease, and the maximum data of dry insulation resistance deduction is more than 20%, and the minimum is 0 found on 10 samples.
Table 1 Verification Data on Dynamic mechanical load test at the condition of ±1000Pa No.
Online since: June 2014
Authors: Zhen Yu Han, Guang Нu Liu, Hong Нa Fu
A system analysis and synthesis is performed in the fields of testing data collection and data analysis and calculation, which are the two important components of residual life prediction.
Some non-destructive testing technologies for data collection and some algorithms for data analysis are summarized and made comparison.
Literature review: algorithms for residual life prediction To predict the residual life, we need to find out logical relationship between data that we directly got from the test and the residual life of the units.
Namely an algorithm is needed to establish a function relation between test data and residual life from the database.
After choosing the right distribution model, by substituting the database into the model the expression of residual life is got, which is a function relation between equipment state vector (detecting data) and predicted residual life[15].
Online since: June 2014
Authors: Peter Groche, Matthias Brenneis
The data can be stored by means of a specialized magnetic write head [3].
Diameter reduction is performed within 0.75 s, followed by a 0.45 s lasting calibration phase when diameter reduction is finished and roundness as well as dimensional accuracy is improved.
Fig. 5: Test setup (left) Calibration Data (right) During the calibration procedure, the piezo tube is loaded with different maximum pressure forces with the help of a compression testing machine.
In order to discuss the course of the data with regard to maximum forces, an incremental analysis approach will be pursued.
Fig. 7: Axial force peaks from experimental data Positive and negative force flanks show a maximum deviation of about 6 %.
Online since: September 2007
Authors: B. Matović, Snezana Bošković, Lj. Karanović, B. Dimčić, Jelena Dukić
The substitution of trivalent rare earth cation such as La 3+ for Ca2+ in the parent CaMnO3 compound causes the reduction of Mn 4+ to Mn3+ [4].
Ca1-xLaxMn1-yCeyO2 composition has not been studied before, and according to literature data Ce ions can enter both A and B positions in different perovskites [6,7].
To derive relevant structural parameters, the experimental data for the Rietveld refinement were taken afterwards in the angular range 20 - 90 º2θ, with a step width of 0.025º and 5 s per step.
Table 1 Crystallographic data and the results of Rietveld refinement for perovskites in CLM and CLMC powders.
Independent of relatively large difference in ionic radii between Mn and Ce ions in coordination VI the literature data claim that Ce gets incorporated into the position B [6].
Online since: September 2007
Authors: James D. Scofield, Anant K. Agarwal, Sei Hyung Ryu, Fatima Husna, Hiroyuki Kosai, Brett Jordan, Sumi Krishnaswami
Reductions in micropipe and dislocation densities, inclusions, and other structural defects in substrates, and the associated reduction in substrate-induced epitaxial defects, have increased the useful wafer area and improved fabrication yield.
The reduction in JFET inverter current from 3.6 A to 3.39 A over the same temperature range is attributable to a decrease in the watt-loss characteristic of the magnetic material used for transformer fabrication and thus, an increase in transformer efficiency.
This was in agreement with the STW45NM50 data sheet temperature derating factor of 2.08 W/o C, increase in RDS,ON, observed Hbridge VDS data increases of 1.2 V to 2.1 V, and the fact that MOSFET on-resistance is reduced 25% when operated at the current levels of this experiment.
Fig 5 illustrates the calculation of static loss components for the power switches, as a function of temperature, from the measured waveform data.
In each case, the offstate power dissipation is seen to be invariant with temperature, consistent with the data of Fig. 6, and is a negligible fraction of the total loss even at 300o C.
Online since: September 2011
Authors: Dan Huang, Wu Zhao
By extracting rolling force signal on actual measured and statistical analyzing calculations of experimental data on the plate rolling mill, rolling force load spectrum was obtained.
By extracting the rolling force signal on actual measured and statistical analyzing calculations experimental data of the plate rolling mill, rolling force load spectrum would be obtained.
By extracting rolling force signal of actual measured and statistical analyzing calculations of experimental data of the plate rolling mill, rolling force load spectrum would be obtained.
Deformation and stress field calculation of the rack using finite element method Combined with the experimental data, deformation and stress field calculation of the rack using finite element method were done.
Extracting the rolling force signal on actual measured and statistical analysis calculations of test experimental data of the plate rolling mill, rolling force load spectrum would be obtained.
Online since: December 2013
Authors: Chu Bei Wang
Adsorption data indicated that active groups of the material had far greater influence on the adsorption capacity than inert functional groups of reduced graphene oxide.
PARGOs were prepared by substitution of graphene oxide (GO) with PCl5 and subsequent thermal reduction.
The substantial shift of the (002) reflection from 0.85 to 0.39 nm after the reduction processing of GO, which confirm the formation of QRGOs from GO.
Online since: January 2016
Authors: Veronika Kotradyová, Erik Vavrinský
Reduction of environmental stress through spatial arrangements and different choices of body positions in indoor environment.
There is emphasized the topic of body positions/postures in standard office working environment whereas more choices of body position is a instrument for reduction of stress and increasing of well–being and chance to get new perspectives, approaches and outputs from human resources as well.
Possibility to choose between activity and passivity and to freely choose body position and work area in the space In this paper we emphasized the topic of body positions/postures in standard office working environment whereas more choices of body position is a instrument for reduction of stress and increasing of well–being and chance to get new perspectives, approaches and outputs from human resources as well .Movement is the most natural way of expression of the individual.
Measured data are primary stored on micro SD card, but for measuring control or online testing is also available bluetooth connection to PC or smartphone.
To recharge the internal Li-Po 120 mAh battery and data transfer to PC is used micro USB connector.
Online since: November 2014
Authors: Li Sheng Li, Gui Bin Liu, Ke Jun Li, Shi Dong Zhang, He Jin Liu, Xing Quan Ji
Wind generation can affect the power quality of power supply system in a certain extent at the same time of energy conservation and emission reduction.
The voltage deviation, system frequency, and harmonic distortion rate are analyzed based on the simulation data outputted by PSCAD.
Online since: April 2022
Authors: Hidayat Panuntun, Anindya Sricandra Prasidya, Gani Mahendra
Continuous GNSS measurements can provide high temporal resolution data.
InSAR data offer an advantage over GNSS measurements.
Methods Data.
However, a specific data preprocessing approach or a big data processing method is required to fully utilize the SAR images captured by Sentinel-1 satellite.
In this way, three-dimensional displacement data observed by GNSS data is required.
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