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Online since: August 2013
Authors: Hong Zhang
Analysis of high wax crude oil group Daqing crude oil and Nile Oman mixed crude oil are high pour point oil, which is Shown by the data in Table 1 and the wax content in crude oil more than 24%.
Table 4 Resin simulation oil sample properties Sample 1# 2# 3# 4# Resin wax ratio 1.0 2.5 5.5 11.1 Viscosity reduction rate (η%) 13 40 36 11 From the data in Table 4 can be seen, four simulation oil samples have typical resin wax ratio.
The viscosity reduction rate with resin wax ratio trend as shown in figure 1.
Fig.1 Relation between viscosity reduction rate and resin wax ratio The resin wax ratio and viscosity reduction rate of 1# and 2# sample in Fig.1 can be seen crude oil with different asphaltene content has similar rules.
Viscosity reduction rate is high in resin wax ratio 2.0 ~ 5.0 range, The tackifying effect and viscosity reduction rate decreased emerge at over high range.
Online since: September 2014
Authors: Ji Guang Jiang, Yue Zeng
In the past research of noise inside the car, vehicle interior noise is mostly passive noise reduction method of vibration damping, sound absorption and sound insulation to reduce, although this method can reduce the noise intensity in the vehicle, but according to noise frequency selective control is difficult, low frequency noise reduction effect is poor, only in the high-frequency broadband noise reduction.
In addition to its low frequency noise control effect is good, effective remedy for the low-frequency noise reduction effect of passive noise control[4].
This system has the advantages of simple realization, good noise reduction effect, the advantages of good operating stability[5][6], so the feed forward controller as the adaptive active noise controller.
The simulation results show that, the FXLMS control algorithm has good noise reduction effect[7].
Using the adaptive active noise control system is designed and constructed in vehicle, in a domestic car uniform steady state operation, noise on the copilot left ear position made active control experiment, and the FFT method analyzes the test data; analysis results show, open the active control system, Sound signals in vehicle noise frequency the main peak frequency that there is obvious attenuation, and then proves that noise selective adaptive active control method in vehicle and control system of independent developing design, the frequency of interior noise cancellation is effective.
Online since: January 2013
Authors: Zbigniew L. Kowalewski, Tadeusz Szymczak
An analysis of the results showed a significant reduction of the axial stress (even equal 90% for the torsional amplitude ±0.8%, in both cases of cyclic loading).
In the case of copper the yield point reduction almost achieved the level of one order.
Such reduction was also discovered for steel and aluminium alloy, however, its drop magnitude was lower than that for the copper obtained.
Kowalewski and Szymczak have also shown that the reduction of proportional limit and yield point under tension is solely attributed to those cases where tension is combined with torsion.
Conclusions The paper presents new data coming from combined loading tests.
Online since: January 2015
Authors: Yury B. Lishmanov, Konstantin V. Zavadovsky, Nikolay G. Krivonogov
GBPS results suggest that the signs of right ventricular dysfunction in PE are: the reduction in its stroke volume, as well as reduction in the peak filling and ejection rate.
The state of the right ventricle was assessed using equilibrium GBPS data.
The results obtained agree with published data on the dissociation between the amount of vascular bed lesions in PE and the degree of the increase in pulmonary vascular resistance [10].
The consequence of prolonged increase in pulmonary vascular resistance is usually dilatation of the right heart compartments and reduction of its contractile function [6].
Conclusion Gated blood pool SPECT with radionuclide technetium 99m-labelled sodium diphosphate decahydrate reveals signs of right ventricular dysfunction (reduction of its stroke volume and peak ejection and filling rate) even with only a small amount of pulmonary hypoperfusion in patients with thromboembolism of pulmonary artery branches.
Online since: December 2010
Authors: Yin Hu Qiao, Chun Yan Zhang, Jie Ping Chen
Weight reduction at wheels is important due to its unsprung mass and the associated reduction of fuel consumption and the better ride-and-handling comfort.
Especially in the front of the car, a weight reduction is necessary to ease the critical mass distribution at the front axle and therefore increase driving safety.
Final product Back to modify Fig.2 Flow chart of metal liquid simulation The procedure includes: open pre-processing module (anyPRE), imported in CATIA have built a 3D model of STL files, setting the casting parameters, and set the simulation end condition, then save the file as *. gsc format, Start anySOLVER calculation, and finally open the results analysis module anyPOST, to observe the results, including process data, simple contraction and micro-structure prediction three parts, process analysis specifically with filling time, solidification time, filling the order, solidification order, the order of gas volume.
Fig.3 Simulation results of process data Fig.4 Simulation results of simple shrink Fig.5 Simulation results of microstructure prediction Summary This research concentrated on development of the process method for automobile parts and prediction of the optimal casting conditions that were applied to the casting of an actual product shape.
Online since: February 2011
Authors: Jiu Ju Cai, Tao Du, Qi Zhang, Xiao Ying Wang, Da Wei Zhang
At present, based on the current functions such as data collection, monitoring, energy supply and demand balance analysis, energy assessment and management, EMS will develop and tap its own capabilities to realize the real-time forecast, allocation optimization and smart scheduling against energy to meet the actual needs.
Main functions of Energy Management System The functions of EMS can be divided into three levels generally: firstly, the control of energy management equipments and data acquisition from energy equipment; secondly, energy monitoring and scheduling system; last, energy analysis and management.
(1)Data acquisition function.
Collect the production data required for the purpose of monitoring, data calculation, statistics and analysis to achieve energy management in the works
Collect energy consumption data and establish a database according to it and gather the purchase and consumption of all energy and the product and process energy consumption to make up a table of actual energy balance
Online since: July 2006
Authors: Dmitry Orlov, Viktor Varyukhin, Alexey Reshetov, Alexander Korshunov, Irina Korotchenkova, Irina Vedernikova, Lev Polyakov, Sergey Synkov, Alexandr Synkov, Yan Beygelzimer
These undoubtedly important data make it possible to estimate the efficiency of the SPD processing, but do not show the distribution of mechanical properties across the billets.
Tensile test data on the variation of mechanical properties on the Cu billet cross-section after 2 TE passes: (a) - Ultimate Tensile Strength, MPa; (b) - Yield Strength, MPa; (c) - Elongation to Failure, %; (d) - Reduction in area, %; Fig. 4 shows that on the billet cross-section after two TE passes location of the maximum ductility strictly corresponds to the location of the minimum strength.
Tensile test data on the variation of mechanical properties on the Cu billet cross-section after 4 TE passes: (a) - Ultimate Tensile Strength, MPa; (b) - Yield Strength, MPa; (c) - Elongation to Failure, %; (d) - Reduction in area, %; The mechanical properties variation perpendicular to the extrusion axis is shown in Figs 6 and 7
Tensile tests data on mechanical properties in transverse direction in Cu billet after 2 TE passes: (a) - direction parallel to Z axes; (b) - direction parallel to Y axes; -8 -6 -4 -2 0 2 4 6 8 0 50 100 150 200 250 300 350 400 450 0 20 40 60 80 100 YS UTS YS and UTS, MPa Y Axis, mm Elongation Reduction in Area Elongation and Reductionin in Area, % YS: Mean 405.6 MPa; Range 16 MPa; UTS: Mean 414.8 MPa; Range 17 MPa; Elongation: Mean 10.2 %; Range 1.7 %; Reduction in area: Mean 72.6 %; Range 10.4 %
The comparison is based on data reported in [16], where authors used the same material and tests conditions.
Online since: July 2022
Authors: Dong Won Jung, Krishna Singh Bhandari, Nodirbek Kosimov, Si Jia Li, Wen Ning Chen
Many ideas were put forward to solve this problem, weight reduction seems to be the most feasible solution [1, 2].
Material replacement is the most direct way to realize weight reduction, which uses light metals like Al to take place heavy materials like steel.
Engineering stress-strain curves were got after tensile tests, then transformed engineering stress-strain data into true stress-strain data by calculating.
Table 2 RMSEs between fitting result data and experiment data Strain rates [s-1] 0.0003 0.003 0.03 Temperature [℃] 360 430 500 360 430 500 360 430 500 RMSE 1.70 0.23 0.10 2.48 0.44 0.15 7.41 3.15 0.26 Conclusions In order to investigating flow stress behavior of material Al A5005 at high temperature, twelve hot tensile tests at temperatures 360℃, 430℃, 500℃ and strain rates 0.0003s-1, 0.003s-1, 0.03s-1 were set up.
A constitutive model and data for materials subjected to large strains, high strain rates, and high temperatures[J].
Online since: July 2019
Authors: Tobias Höchbauer, Nikolaos Tsavdaris, Christian Heidorn
The future challenges for SiC device technology are cost reduction and increased reliability.
Introduction As the market share of SiC devices in power electronic application grows continuously, cost reduction and reliability improvement of SiC power devices becomes essential.
The defect density data show that the new epitaxy process results continually in a BPD to TED conversion rate ranging from 99.995 to 100% with an edge exclusion of 2.5 mm.
Summary Cost reduction and increased reliability are the main future challenges for SiC devices and the epitaxial layer growth is a key process in order to accomplish this.
Yield increase during epitaxial growth is achieved by the reduction of structural defects such as basal plane dislocations and triangular defects and the increase of doping and thickness uniformities.
Online since: November 2013
Authors: Erlinda O. Yape, Nathaniel M. Anacleto
The high recovery of iron and nickel in the alloy indicates the highly reducing condition prevailing in the smelting reduction experiments.
The amount of nickel content in the metal at the initial stage of reduction was higher compared to the chromium content.
The reduction of iron was an important control factor, since iron dilutes nickel and chromium and thus lowers the Ni and Cr concentration in the alloy.
A typical plot is shown in Fig. 6 for the data in all the series of experiments at 1550°C under an argon atmosphere.
The high recovery of iron and nickel in the alloy indicates the highly reducing condition prevailing in the smelting reduction experiments.
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