Search Options

Sort by:

Sort search results by

Publication Type:

Publication Type filter

Open access:

Publication Date:

Periodicals:

Periodicals filter

Search results

Online since: November 2018
Authors: Zakaria Bouraoui, Sadok Benmebarek, Fernando Lopez-Caballero
Various sets of real data (forty accelerograms) records were applied at the bedrock level to assess model’s dynamic response for different earthquake scenarios.
Various sets of real data (forty accelerograms) were used to assess model’s dynamic response for different earthquake scenarios.
Various sets of real data (forty accelerograms) are used to assess dynamic response for different earthquake scenarios.
Hysteretic damping is added to this model by fitting a tangent-modulus function curve to the (G/Gmax) versus strain data, as shown in (Fig. 9).
Various sets of real data (forty accelerograms) are used to assess model’s dynamic response for different earthquake scenarios.
Online since: May 2010
Authors: S.M. Kazemzadeh, Ali Shokuhfar, Mohammad Reza Vaezi, Amir Hassanjani-Roshan
The final data show that microwave processing has unique advantages over conventional heating processes.
Ag nanoparticles can be synthesized using various methods: laser irradiation [8], sonochemical deposition [9,10], photochemical reduction [11,12], chemical reduction of metal salts [13], electrochemical [14], γ-radiation [15] photochemical [16], etc.
Silver nanoparticles have been synthesized by reduction of silver nitrate in EG involving PVP within 60 seconds.
Online since: May 2011
Authors: Wei Jian Yi, Fan Zhen Zhang
Base on the missing of some specific structure modal shapes and reduction of the frame horizontal stiffness, it can be revealed that the interior slab-column connection cannot transfer the unbalance moment well.
This system is highly advantageous because of the formwork costs reduction, fast execution and easy installation.
This paper reports the modal experimental data and analysis of FEM (ANSYS 10.0).
(3) Base on the dynamic test data, the temperature changes (8.5℃) during the experiment show little effect to the changes of frequency of flat plate frame in horizontal/vertical direction
(4) With the horizontal direction dynamic test data and FE model analysis, it is found that the lateral stiffness of experimental interior column replaced by the mechanical jack reduce to 10%.
Online since: November 2012
Authors: Xi Min Cui, De Bao Yuan, Kai Long Hu, Wan Yang Xu, Feng Li
The data sets contain building, road, tree, low vegetation/grass, cars, and artificial ground.
A small part test data, of which area is about 51268.3m2, is merely selected from original data sets as entire data amount is too large.
A false positive (FP) is where the detected road result that is not in the reference data.
For correctness, a buffer is constructed around the detected road data and reference road data lying in the buffer are taken as matched.
Li, “Automatic Road Extraction from Lidar Data Based on Height Fitting Difference,” LIDAR & RADAR 2011(2011)
Online since: January 2014
Authors: Zhen Nan Fan, Jian Gao
Failure Analysis and No-load Voltage Waveform Optimization and damper bar Heat Reduction of a large Tubular Hydro-Generator Gao Jian1,a , Fan Zhen-nan1,b 1 Technology & Skill Training Center of Sichuan Electric Power Corporation Chengdu China,610072 aGaoJian_sc@126.com, bfanzhennan@126.com Keywords: failure analysis, tubular hydro-generator, no-load voltage waveform ,damper bar, loss and heat Abstract.
For the failures of a 30MW tubular hydro-generator such as no-load voltage waveform is bad, damper bars are over heat, a multi-slice moving electromagnetic field-circuit coupling FE model of tubular hydro-generator and a 3D temperature field FE model of the rotor are built respectively.And the computations about the failure reasons and the optimized design schemes are implemented and analyzed by these modles.And the calculation results are coincident well with the test data.
The basic data of the tubular hydro-generator The basic data of the generator are showed in Table 1. 5 different design schemes are calculated, which are showed in Table 2, t1 is the stator tooth pitch, which is invariant, t2 is the pitch of damper bars.
By coulomb norm ▽·A=0 and the boundary condition of the problem region, the 2D boundary value problem of nonlinear time-varying moving electromagnetic field for the generator is then obtained: (2) Table 1 The basic data of the generator Parameter Value Rated power (MW) 30 Rated voltage (kV) 10.5 Power factor 0.92 Number of slots per pole per phase 11/2 Table 2 5 design schemes of structure Design scheme t2/t1 Slot skewed of stator δB (mm) Failure scheme 0.62 0 0.5 Optimized scheme1 0.8 0 0.5 Optimized scheme2 0.98 0 0.5 Optimized scheme3 0.98 0.5 slot skewed 0.5 Optimized scheme4 0.98 0.5 slot skewed 0.1 Fig. 1 The over heat regions of damper bars in rotor poles Fig.2 The problem region and meshes of electromagnetic field B.
Online since: November 2015
Authors: Daniel Ghiculescu, Niculae Marinescu, Tomasz Klepka, Ovidiu Dorin Alupei-Cojocariu
The entry data for horn geometry determination were the dimensions and own frequency of transducer subassembly, joining ultrasonic horn.
Preliminary Dimensioning of Usual Cylindrical Stepped Horn A preliminary dimensioning was carried on for usual cylindrical stepped horn, standing as entry data for FEM modelling of complex profiled horn, integrating the tool to be axially vibrated during micro-drilling by EDM+US.
supply and cooling flange PZT rings reflecting bush radiant bush Fig. 2. 40 kHz Transducer made by IMSAR The transducer assembly provided by the Institute of Solid Mechanics of the Romanian Academy - IMSAR (Fig. 2) has the own series frequency fotr= 40805 Hz – entry data for this application type [10].
Increase of taper angle at 6o can compensate somehow these reductions, i.e.
Only fine adjustments of step lengths by their reduction were executed for resonance.
Online since: August 2022
Authors: Manish Oraon
ANN generated a network between inputs and output with the entered test data.
The experimental data are trained by using the Levenberg-Marquardt (LM) algorithm.
Sufficient accuracy on the test data set or the maximum number of iteration whichever first activated is adopted for the model.
It is recorded that the training is optimized at fifth iterations i.e. sufficient accuracy of test data is achieved shown in Fig. 8.
The FFB is applied with a few data to check the suitability of ANN in the ISF Process too.
Online since: February 2006
Authors: Franz Moraw, Khalid Fatih, David Wilkinson, François Girard
The oxygen reduction reaction at the cathode-PEM interface is the main limiting factor for PEMFC performance and efficiency.
Specifically, the Fe 3+/Fe 2+ redox couple was chosen, with the following cathode reaction: Fe 3+(aq) + e ⇌ Fe 2+(aq) (eq.1) The redox cathode species has the following advantages over the conventional PEMFC cathode: - No noble metal catalyst is needed, carbon based materials can be used for Fe 3+ reduction - Enables the use of a three dimensional electrode structure (high surface area) - No need for a complex three-phase zone for oxygen reduction - Very fast kinetics at the cathode with high exchange current density - No water management, humidification, or cooling concerns (liquid catholyte) - Possibility of less expensive membranes and simpler flow field/cell designs All of these advantages can result in fuel cell system simplification and cost reduction.
In this work, the kinetics of ferric reduction and its diffusion properties at the cathode are evaluated, using CV and EIS in a simulated bio-electrolyte (SBE).
However, from a fuel cell application perspective Pt and TGP-H090 will give the same performance at the working iron concentration (obtained from optimized bioreactor data).
Online since: July 2015
Authors: Jarosław Stryczek, Pavel Rekadze, Leonid Rodionov
There are several constructive measures for pressure pulsations and vibrations reduction describes by the authors [4].
It should be noted that one of the effective methods for noise and vibration reduction is using vibration absorbing polymer materials [5].
It was stated that watering of sliding surface with water or methanol solution entails to friction coefficient reduction.
Future Work Future work will aimed on: - test rig research in efficiency determination and etc.; - data acquisition of vibroacoustic characteristics on the different micropump working regimes[11]; - improvement and optimization of micropump construction..
Shakhmatov, Reduction of Vibroacoustic Loads in Aviation Combined Pumps, Proceedings of the 29th Congress of the International Council of the Aeronautical Sciences, St.
Online since: June 2012
Authors: Zhao Xiang Deng, You Qiang Cao, Pan Wang
Seeking a good kind of the vibration reduction technology also has become a focus problem for academia and engineering experts.
When it combines with the finite element model, the vibration equation dimension is too big, which can cause the reduction of the system to be difficult.
It can be seen that the natural frequencies and loss factors of theoretical calculation for the first 4 modes are very close to the experimental data .
The numerical example shows that: the modeling method for the SCLD beam is correct, the adaptive controller can express the active performance of SCLD structure effectively and have a good vibration reduction effect.
Lan.MODEL REDUCTION OF VISCOELASTIC FINITE ELEMENT MODELS[J].
Showing 9071 to 9080 of 40694 items