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Online since: November 2011
Authors: Jun Zhang
The data shown in Table 1 suggest that the BET surface area, the micro-pore and the meso-pore volumes were significantly affected by the presence of Fe3O4.
Thermal investigations of direct iron ore reduction with coal.
Reduction kinetics, magnetic behavior and morphological changes during reduction of magnetite single crystal.
Kinetics of reduction of iron oxides by H2 Part II.
Low temperature reduction of magnetite.
Online since: January 2019
Authors: Karsten Menzel, Jürgen Bieser
In this concept data is no longer hosted in a single data centres but is “mirrored” across multiple DC.
Based on the above, the authors argue that more innovative approaches for the management of engineering services in Data Centres are required, i.e. methodologies extending the scope of traditional maintenance strategies, e.g. by increasing the number of monitoring points [2] and exploiting the available data through advanced data analysis and data mining techniques.
Facility Management in Data Centres In an “ideal” Data Centre only two organisations would exist: The primary IT service provider and the secondary FM-services provider.
· All Data Centres followed the preventive, time based maintenance model.
Babcook, “Six Models of the Modern Data Centre,” Informationweek, 14 June 2014.
Online since: August 2024
Authors: Massimo Mazzillo, Davood Momeni, Soenke Habenicht, Zhe Yu, Joachim Stache, Jesus Urresti, Christian Liguda
Fig.2. 4H-SiC PIN Diodes VF at 10A (left y-axis-black data points) and TLM Ti P+ contact ρC (right y-axis-red data points) as a function of the dopant activation annealing temperature and time.
Fig.3. 4H-SiC PIN Diodes VF at 10A (left y-axis-black data points) and TLM Ti P+ contact ρC (right y-axis-red data points) as a function of the SiC surface thickness etched after the high temperature dopant activation annealing process.
Fig.4. 4H-SiC PIN and MPS Diodes VF at 10A (left y-axis-red data points) and TLM Ti P+ contact ρC (right y-axis-red data points) as a function of the Schottky annealing temperature.
Fig.5. 4H-SiC MPS (left y-axis-red data points) and PIN (right y-axis-red data points) diodes VF at 10A as a function of the drift layer doping.
Fig.7. 4H-SiC PIN Diodes VF at 10A (left y-axis-red data points) and IL at 650V (right y-axis-red data points) as a function of the P+ dose and metal contact.
Online since: August 2015
Authors: Mouleeswaran Senthilkumar, M. Yuvaraja, M. Kok
The defects such as unbalance of impeller, bent shaft in pump, misalignment of shaft, hydraulic pulsation, cavitation and bearing defects are diagnosed using vibration data.
Thus by diagnosing centrifugal pump using vibration data reduces cost and time for periodical maintenance.
This data is of absolutely no value to the vibration analyst unless some specific details about the machine are known.
By changing the accelerometer orientation, data was recorded in other two axes at the same bearing location.
From the data collected, the defects are identified through vibration analysis by finding the difference in amplitudes.
Online since: July 2011
Authors: Jian Hua, Jun Ren
Refer to "IPCC Guidelines", we use cement production data to estimate emissions.
Carbon Emissions Coefficients and Data Collection.
The initial coefficients are from IPCC, and to be consistent with the statistical data, we do the unit conversion.
The original physical volume of main energy end-consumption data is taken from "China Energy Statistical Yearbook”.
The data of population came from” China Statistical Yearbook”.
Online since: August 2011
Authors: Yang Yang, Yin Hua Liu
The on-line measurement data are monitored to identify whether the assembly process is in statistic control.
The and are estimated by and S which are calculated based on the historical data.
The data are computed with sample size of m.
The network is constructed based on the rich historic data set of on-line measurements.
Fig. 3 Demonstration of the headlamp bracket assembly The historical data of the three variables were used to construct the Bayesian network for terms reduction and diagnosis.
Online since: January 2014
Authors: Jin Feng Men, Zhi Hui Du, Ming Chun Jia
In addition, the existence of K+, Na+, NH4+, Ca2+ and Mg2+ in solution caused a reduction of maximum adsorption capacity for both of the composites.
The bed depth service time (BDST) model and the Thomas model were used to analyze the experimental data and the model parameters were evaluated.
At low depths, the Cs+ do not have enough time to diffuse into the surface of the composites, and a reduction in breakthrough time occurs.
As seen from Fig. 3, two straight lines almost pass through the origin, which indicate the validity of the BDST model for the adsorption data of PAN-KCoCF and PAN-KNiCF.
The data in Table 3 also indicate that values of q0 decreased in the presence of other cations compared with the absence of them for both PAN-KCoCF and PAN-KNiCF.
Online since: January 2018
Authors: Wen Zhong Zhao, Yi Hang Yu, Jun Zhang
The results show that the thicknesses and elastic modulus have a significant effects on TL, TL are enhanced with the thicknesses increasing of the poroelastic materials layers, a 4.9dB addition of TL is achieved when thickness is added from 2cm to 3cm; TL are enhanced with the reduction of the elastic modulus in considered frequency range, and TL are reduced with the declining of viscous lengths and with the addition of the flow resistivity when the frequencies are higher than 600Hz.
HU Ying[10] has been set up a finite element model for calculating the acoustic transmission performance of double-wall sound packages with the poroelastic materials, the sound transmission loss is achieved, and the numerical results matched well with the measured data.
TL are calculated for three elastic modulus with 440000N/m2(initial), 44000 N/m2 and 4400 N/m2, respectively, the curves of TL versus the elastic modulus is shown in Fig.3, Fig.3 show that the TL are increasing with reduction of elastic modulus in lower frequency such as less than 550Hz, but when frequency is higher than 550Hz TL of elastic modulus 4400 is lower than ones of elastic modulus 440000(initial).
(1) The thicknesses have a significant effects on TL, TL can be enhanced with the thicknesses increasing of the poroelastic materials layers, especially, TL can obviously be added at the acoustic insulation trough, and the frequency of the first acoustic insulation trough can also be added; (2) The reduction of the elastic modulus of the poroelastic materials can result to the addition of TL in considered frequency range; when frequency is less than 550Hz, the lesser value of the elastic modulus can result to a more addition of TL; (3) The flow resistivity have a little effects on TL when the frequencies are less than 300Hz, generally, TL can be reduced with the increasing of the flow resistivity when the frequencies are higher than 600Hz; (4) The reduction of the viscous length can result to the reduction of TL when the frequencies are higher than 600Hz, and the viscous lengths has almost non-effect on TL when the frequencies are lower than 300Hz.
[7] Rumpler.R , Deü.J-F, Göransson.P, A modal-based reduction method for sound absorbing porous materials in poro-acoustic finite element models, The Journal of the Acoustic Society of America, 132(5), 3162–3179, (2012)
Online since: February 2011
Authors: Mohammed Rafiq Abdul Kadir, Mat Uzir Wahit, Mazatusziha Ahmad, Khairul Zaman Mohd Dahlan
Incorporation of PEG shows a synergism effect on the reduction of blends viscosity.
Viscosity Reduction of UHMWPE/HDPE/PEG Blends.
The flexural strength was maintained up to 60wt% of HDPE, with further reduction in strength observed with increasing HDPE concentration.
The reduction in strength from 70 to 90 wt% HDPE is expected for blends with high fractions of HDPE.
In this work the specific surface area of HA is 33.05 m²/g (from particle size distribution data) and the particle size is 7.51 µm, with its irregular shape (Fig. 3c) showing encouraging result and is favorable to improve surface contact between the filler and matrix, thereby increasing the strength of the composites.
Online since: April 2014
Authors: Jun Wei Bi, Fang Ouyang, Jian Wei Han, Wei Ming Liao
To analysis observed data of the long-term settlements in the dyke, three stages can be gotten i.e.
This paper based on observed data of a long-term settlements, making an analysis into the effect and the settlements developed characteristics of foundation reinforced by geotextile-encased sand columns.
The data are from a land reclamation project for the airplane dockyard (EADS) at the Elbe River in Hamburg, Germany.
And in this practical engineering, geotextile encased sand column has good effect. 1 Compared with the rear-anchored raking pile method previously,The solution saves a lot of money. 1) eliminated 35000 tons of steel, since a sheet wall was not necessary ; 2) saved 150000 m² of tidal mud flat reclamation; 3) used 1100000 m³ less sand to fill up the dike , for steeper slope(1:6 against 1:20), and large settlement reductions. 2 Cut down the time.
3 The elimination of bulging of the rock column controls the rock quantity, reducing the amount of sand,and making construction costs more predictable. 4 Produced very little noise pollution (12 vibro displacement machines reached a noise level of 50 dba at a distance of 1000 m). 5 Effected a dramatic settlement reduction and a high settlement acceleration similiar to that of vertical drains.
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