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Online since: January 2009
Authors: M. Gizelska, D. Kozanecka, Z. Kozanecki
Nowadays rotating systems are equipped with diagnostic systems that are based on collecting and recording measurement data and that process a huge amount of data during the machine operation.
After the end of tests, a signal of readiness to initiate the drive will be generated; • data collection and recording in real-time after the drive starts its operation (with the rotating shaft), comprising: the start-up, the shut-down, operation at the nominal rotational frequency and operation in the "overspeed" mode; • "on-line" recording and control of parameters of the system operation during each phase and a selection and reduction of saved data files in the non-volatile memory that concern mainly untypical behaviors of the system; signaling and generating different level alarms in cases of exceeding data limit critical values for the operation of the power transmission system or the bearing system.
Fig. 5 presents the wheel of clearances for the model and experimental data obtained during the test.
Diagram of the phase portrait for the model data Fig. 5.
Diagram of the clearance wheel for the model and experimental data During the test procedure, the measurement data for a given number of control points evenly distributed on the periphery of the clearance wheel are registered.
Online since: October 2011
Authors: Ji Xiu Zhang, Heng Hu Sun, Xue Lian Niu
Moreover, due to the lack of minerals with cementitious character, Bayer red mud particles tend to be very fine and can be easily carried by air currents to nearby lands where a reduction in soil fertility results[[] Yong xin QU, GUAN Wen zhang.
Zirconia rotor was used in this experiment with diameter 7mm and length 20mm. 29Si NMR testing resonance frequency was 59.62MHz; the rotor working frequency was 4000 r/s; repeat time delay was 2s; sampling time was 0.246s; pulse width was 45°; spectral width was 30 kHz; 4000 points were collected for data; and the testing temperature was room temperature. 27Al NMR testing resonance frequency was 78.2MHz; the rotor working frequency was 4000 r/s; repeat time delay was 0.1s; sampling time was 40ms; pulse width was 45°; spectral width was 70 kHz; 4000 points were collected for data; and the testing temperature was room temperature.
Moreover, the property reflects not only the chemistry of the hydration reaction but also physical effects such as water reduction and stacking.
Online since: July 2012
Authors: Ji Ku Zhang, Wei Tan, Lu Lu Dai
With slow development of Chlorine dioxide technology,water plant begin to study and apply Chlorine dioxide in the late of 1990s,however the progress of study in cost reduction and increasing of conversion rate and purity is no significant.
The fourth step: observe the experimental phenomena, record texhe perimental datas.
Water bath temperature continued to increase, the production of ClO2 decreased,the reason is that when the temperature was high, redox ability strengthened, + 5valence state of Cl further reduction into Cl2,thus it reduced production of ClO2 relatively.
HCl solution was not only a reductant, but also provided acid condition required by the reaction,so it’s necsssary to study the effect of the mass fraction of HCl to the experiment.The water bath temperature was 70℃,the gas pressure was 60 ml·min-1 ,other initial conditions remained unchanged,considering the influence of HCl with different mass fraction to the ratio of ClO2/Cl2 and yield(%) of ClO2, the specific datas are shown in Fig 4.
According to the experimental data,the best value of the mass fraction of HCl is 24%.
Online since: June 2012
Authors: Matthew R. Hall, Xiao Long Wang, Mercedes Maroto-Valer, Aimaro Sanna, Marco Dri
The aim of this work is to investigate the CCSM technical barriers towards the reduction of the process costs and the commercial utilisation of its by-products.
An autosampler (Cetac ASX-520) and a concentric glass venture nebuliser (ThermoFisher Scientific) were used and the data processing was undertaken using a Plasmalab software (version 2.5.4, Thermo-Fisher Scientific, UK).
These data need to be confirmed by XRF analysis on a larger representative sample.
The production of high-strength concrete represents the most likely route for large volume consumption of micro-silica produced during the reduction of atmospheric greenhouse by CCSM.
Online since: October 2014
Authors: Xing Zheng Zou, Shu Ping Ge, Hong Wang, Fang Li, Shi Qing Zhang, Rui Tang, Jin Tai Wang, Feng Yu
The data obtained in this study were analyzed by using statistical software SPSS v. 11.5 and reported as means±SD.
Then the data obtained under different treatment groups were statistically compared.
But the reduction in area is very closed to 316L.
Table 1 Mechanical properties of biomedical nickel-free stainless steel with high nitrogen Material tensile strength (Rm/Mpa) yield strength (Rp/Mpa) coefficient of elongation (A/%) reduction in area (Z) Cr17Mn15Mo2N0.42wt% 1010 800 34.5 62.5 Cr17Mn15Mo2N0.54wt% 1020 855 29 63.5 Cr17Mn15Mo2N0.60wt% 1060 905 27.5 60 316L 480 177 40 60 Fig.1 Microstructure of biomedical nickel-free austenitic stainless steel with high nitrogen Cytotoxicity test.
Online since: January 2015
Authors: Artem Korsun, Anastasiia Fidrikova, Olga Grishina, Alexey Marichev
However data about one of the main performance indicators of acoustic isolation of mineral wool – coerced dynamic modulus of elasticity Ep are absent.
0.02 10.5 1.58 13 0.0249 14 0.0181 10.7 1.64 12.3 0.0214 10.6 1.82 13.1 0.0257 11 1.2 12.4 0.0198 10.7 1.6 14 0.025 11.1 1.23 12.5 0.0179 11 1.2 15 0.0226 11.2 1.02 13 0.0219 12 0.468 12 0.519 13.2 0.0162 Thickness assay h, [m] 0.018 0.018 0.018 0.018 0.018 0.018 Resonance frequency f, [Hz] 10 40 10 40 10 40 Еd, [N/m²] 14197.8 572456 14197.8 572456 14197.8 572456 Еp, [N/m²] 1.34∙105 6.92∙105 1.34∙105 6.92∙105 1.34∙105 6.92∙105 Calculation of impact noise insulation of flooring 1. without acoustic insulation layer The index of the reduced impact noise level Lnw, [dB], under the floor without a sound-insulating layer with the floor of the roll materials should be determined by the equation (14) [21]: Lnw=Lnw0 - ∆Lnw, (4) where ∆Lnw - index decrease reduced impact noise level, [dB], received in accordance with the published data
The difference 7 [dB] (under a load of 2000 [N/m²]) and 1 [dB] (under a load of 5000 [N/m²]) shows reduction impact noise by the use of basalt wool.
[5] Beranek L.L.Noise Réduction (1960) Mc.Graw-Hill Book Company, pp 369-726
Online since: April 2020
Authors: Agus Kurniawan, Arief Ramadhan Permana
Silica fume is a product produced from the reduction of high purity quartz with coal in electric arc furnaces in the manufacture of silicon or ferrosilicon alloys.
The result of this concrete showed that the optimum noise reduction coefficient was at the void ratio of 25% [16].
In each sample, 2 channels were used which were placed in half span and quarter spans, allowing different data variations to be obtained.
In addition, the rigidity of porous concrete blocks is also reviewed by using natural frequency testing data, which is calculated using a formula Fn=12πkm or k=4π2mFn2.
Online since: July 2014
Authors: Yu Hui Xing, Gui Ping Zhu, Yong Hong Xia, Jian Bo Xin
Smart Microgrid is used to accept the distributed new energy power generation, including small hydropower, and it can realize the optimal allocation of energy, improve the power quality and power consuming efficiency, so as to promote energy conservation and emission reduction.
For the constraints given by Formula (3), exterior penalty function method is introduced, to reckon the constraints into the objective function in the form of a penalty term of penalty function, with the value of penalty factor of 100, as shown in Formula (6): (6) Optimization results According to natural lighting data of the microgrid area, using Formula (1) to calculate the output of small-scale photovoltaic power stations as shown in Figure 2.
Typical daily load factor curve of the microgrid area According to the above model and data, using MATLAB to conduct optimal calculations, use MATPOWER flow calculation program and particle swarm optimization, and then the optimized active power output of four small hydropower stations will be obtained, as shown in Figure 4.
The comparison of line loss of the system before and after optimization is shown in Table 5; we can see that the system line losses have a significant reduction as well after optimization.
Online since: July 2014
Authors: Yu Ping Guo, Ping Wang
Porous and ultra-light GO gels were obtained, and RGO (reduced GO) gels were also prepared by reduction with glucose.
After exfoliation and reduction of GO-PVA, the regular stacks of GO were destroyed and the diffraction peak became disappeared.
Some kinetic parameters at 30 ºC, estimated from the experimental data and Eq. (1), are listed in Fig. 3.
The experimental data were applied by the isotherm models of Langmuir Eq. (3).
Online since: March 2022
Authors: Sunarti Abd Rahman, Hematharshini Agamparam
The data in FTIR spectroscopy is given by the transmittance versus the wavelength.
Permeate flux and salt rejection were calculated from the recorded data.
The appearance of the C=O band is due to the effect of carboxyl group, which indicates that the reduction modification by formic acid has occurred effectively.
These two criterions are important to promote better mass transfer and prevent liquid filling the pore of the membrane which can lead to fouling and reduction in the permeate flux [11].
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