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Online since: October 2011
Authors: Shao Hui Wang, Yu Shan Deng, Yuan Yao
Theoretical Model of Multi-Point Stretch Forming First, CAD data was imported into self-developed software for the adjustment of punch element shape, then the heights of punch elements were obtained, and modeling and analysis could proceed by the explicit, dynamic version of ABAQUS/Explicit.
In the research of effect of the free length on forming parts, widths of sheet metal were all 1200mm and the thickness of elastic cushion was 30mm.The data of free lengths was shown in Table 1.
If the thickness reduction of forming part is too large, the quality standard would not be reached.
Take the data of thicknesses from the AB and CD lines into Eq.1, and the average reduction ratio Tμ, from different free lengths could be obtained.
(3)The longer the free length is, the smaller the thinning ratio of sheet metal will be, but the degree of reduction is less
Online since: February 2012
Authors: Khudheyer S. Mushatet, Abdul Kareem A. Wahab, Wissam H. Ajeel
A modern high response pressure transducers along with a data acquisition system was used to obtain the pressure fluctuations at multiple points on the centrifugal pump volute.
The details of the considered impeller technical data are described in table 1.
Fig.2 Test rig view. 1-Personalcomputer 2-Data acquisition and logging interface 3-Piezoresistive pressure transducer 4-Transducer power supply 5- piping 6-Gate valve 7-Rotameter flow 8-Centrifugal pump 9- Reservoir.
Pump technical data.
For the backward curved blade impeller, one contributor for the head reduction at higher flow rates is the reduction in Euler work due to relative velocity at the exit of the impeller.
Online since: July 2012
Authors: Zhe Ming Zhang, Da Wang, Li Li Wang, Hong Bin Wang, Ji Gang Wang
Table 1 Solution ratio of cake and core at different times reaction time[h] mud acid solid nitric cake core cake core 1 4.70 13.8 5.75 23.4 6 6.91 21.8 8.08 38.7 12 7.50 23.5 11.04 44.5 Determination of heat transfer performance and viscosity reductant of crude oil.Solid nitric acid and hydrochloric acid with certain proportion can form nitrohydrochloric acid,which together with any organic material make the oxidation-reduction reaction occur,and reduce the viscosity of crude oil,generate vast heat.Added 200ml liquor,including 6% solid nitric acid,2% high temperature demulsifying agent,15% hydrochloric acid and 4% hydrofluoric acid,then,added 200ml highly viscous crude(usually viscosity will be 15000mPa·s at 30˚C).Observe the change of viscosity and temperature,experimental data were shown in Table 2.
The emulsification situation of crude oil and acidification residual liquid and preventive measure.Preparation of reaction residual liquid:over-dose rock core react with 50ml liquor,which includes 6% solid nitrate powder,15% hydrochloric acid and 4% hydrofluoric acid,after 24 hours,remove solid phase through filtering;then added 20ml crude oil into the mixture,sufficiently agitate 10 minutes(r=4000rev/min).Resting 24 hours,observe its emulsion breaking situation,data obtained from saturation method was shown in Table 3.
Table 4 Corrosion inhibition rate of CT-1 and formaldehyde(2hr) content of HCHO[%] 0.4 0.8 1.0 1.2 1.4 1.6 2.0 corrosion inhibition rate[%] 50˚C 3.7 2.1 1.4 0.9 0.7 0.3 0.1 70˚C 4.2 3.1 2.4 1.5 1.0 0.7 0.2 content of CT-1[%] 0.1 0.2 0.3 0.4 0.6 0.8 1.0 corrosion inhibition rate[%] 50˚C 2.5 1.6 1.8 0.6 0.3 0.1 0.005 70˚C 3.4 2.0 1.2 1.0 0.5 0.3 0.01 Considering cost and supply of goods,we choose 2% formaldehyde or 1.4% CT-1 as inhibiter,and NTA and HAC as ferrous stabilizer.Then we did some experiment on ferrous stabilizer which field in use,associated data were shown in Table 5.
Table 5 Chelate data of NTA and HAC on ferrous ion(50˚C) dosage of HAC[%] 0.1 0.5 1.0 1.2 1.5 [Fe2+][ %] 8000 3000 875 600 100 dosage of NTA,][%] 0.04 0.06 0.1 0.3 0.4 [Fe2+][ %] 2469 2125 1650 1275 200 We can conclude from table 5 that,when the dosage of HAC is 1.2%,concentration of [Fe2+] decline from 10000 mg/l to 600mg/l,this result can not arouse secondary precipitate jam;when the dosage of HAC is 0.4%,concentration of [Fe2+] decline below 300mg/l,this result can completely meet the need of oilfield construction.
(2)solid nitric acid has the characteristic of degrading heavy crude and asphaltene.The significantly reduction of crude oil viscosity is of great value to remove organic jam,such preponderance does not exist in conventional acidification
Online since: December 2010
Authors: Ling Wang, Xi Yuan Liu, Yan Feng Li, Zhao Xia Chen
The related data indicate that concrete is early strength in the lower water-cement ratio[5].
The parameters of mix proportion of ordinary poured concrete can be referred in the relative data.
The data are shown in Table 6.
Table 6 Cement-aggregate ratio of two kind of concrete Unconfined compressive strength Cement-aggregate ratio Reduction rate [MPa] Ordinary poured concrete Tamped concrete [%] 20 0.15 0.09 40 25 0.19 0.11 42 30 0.22 0.16 27 35 0.24 0.20 17 40 0.28 0.25 11 The comparison data indicate that the cement-aggregate ratio of tamped concrete is smaller than that of ordinary poured concrete for the same unconfined compressive strength.
When the compressive strength is small, the reduction rate of cement-aggregate ratio is 40 percent.
Online since: September 2021
Authors: Julia Nerantzia Tzortzi, Rola Hasbini
Moreover, micro-analysis of data would efficiently optimize the design of the granular concrete constituents.
Other obstacles faced by green mixture solutions are compliance with regulatory standards, non-suitability for various structural performances and applications, and lack of durability data spanning twenty years or more [23].
Furthermore, performance data should be strictly monitored and should form the basis for further development and research.
Reliable analytical, experimental, and numerical models are to be developed while documenting field data.
Recently, the Internet of Things (IoT) infrastructure, in smart cities, promise comprehensive structuring of coherent sustainable data pipelines.
Online since: May 2014
Authors: Gareth A. Vio, Dries Verstraete, Benjamin J. Morrell, David J. Munk
This reduction in rigidity of the structure requires innovative structural concepts and a stronger focus on aeroelastic deformations in the early design and optimisation of the aircraft structure.
Quinn [12] compared early computational models with experimental data, which at that time showed discrepancies in the thermal model.
Matlab® serves several purposes; an interface with the user, an automation of the data transfer and analysis runs and the driver of the aeroelastic iteration.
The tool is built around a Matlab® core program, which automates data transfer between software components in an optimisation loop.
III, “Hyper-X Hot Structures Comparison of Thermal Analysis and Flight Data,” Pasedena, CA, USA, 2004
Online since: December 2012
Authors: Cui Hong Ma, Wei Qiang Zhang
Based on Atomic Spectrometry for the Determination of Titanium Element in Molten Steel Cuihong Maa, Weiqiang Zhangb 46 West Xinhua Road, Tangshan 063009, P.R.CHINA aemail: mch208@sina.com, bemail: 363527279@qq.com Keywords: atomic emission spectrometry; qualitative analysis; titanium; spectral data Abstract.
Experiments A grating spectrometer Omni-λ300 ( Zolix );0.1nm of Resolution; a data acquisition system for type DCS300P ( Zolix ); photomultiplier tube for the type of PMTH-S1-CR131; a HVC1800 high-voltage regulated power supply; A medium frequency induction furnace and its control cabinet.
Fig.2 The spectrum line collected from Liquid steel The experimental data processing Figure 2 spectrum of the noise reduction processing, Selection of wavelet denoising method for denoising, then qualitative analysis.
Using compact orthogonal wavelet db5 of Daubechies, wavelet on the signal to 5 layers decomposition, get figure 3 Fig.3 Denoised signals of liquid steel After noise filtering, output spectral information data, denoising spectral data and elemental spectrum table in the titanium atom emission line wavelength values ​​were compared, we can find four stronger titanium atomic emission lines, as shown in Table 1.
Online since: May 2014
Authors: R. Ganesh Narayanan, V. Satheeshkumar
While comparing the formability of adhesive bonded blanks with respect to different orientations, transversely oriented defect shows more reduction than 45° and longitudinal cases.
Introduction Adhesively bonded structures have emerged almost in all structural components fabricating fields with many advantages in terms of design flexibility, weight reduction, cost reduction and ease of fabrication.
It was found that foam density resulted to be the most significant parameter able to affect formability, lower density foams led to a remarkable reduction of defect rate.
After the completion of tensile tests and IPPS formability tests, the load–extension behaviour of all bonded blanks was obtained from the machine data.
The reduction in ‘n’ value of bonded blanks is an indication of reduction in formability.
Online since: January 2013
Authors: Patrick Fiorenza, Filippo Giannazzo, Fabrizio Roccaforte, Alessia Frazzetto, Lukas K. Swanson
Despite the improved interfacial morphology, a reduction of the peak mobility (from 40 to 24 cm2V-1s-1) was observed using the carbon capping layer.
While Haney et al. [11] observed that the use of the capping layer does not significantly affect the channel mobility in a wide PIA range (1200-1800°C), Naik et al. [12] recently reported a reduction of the mobility when the devices are processed with a capping layer.
As can be seen, a reduction of the Dit value close to the conduction band edge of a factor two was observed in the sample annealed without cap.
Fig.3 shows how our experimental data of mobility µFE and total trapped charge densities for the samples processed with and without cap perfectly follow this general trend.
Online since: June 2011
Authors: Zhi Hong Wang, Xian Zheng Gong, Chen Li, Su Ping Cui, Yan Zheng, Bi Chuan Chi
Besides that, IPCC also published the methods and data necessary to estimate emissions from stationary combustion.
Methods are provided for the sectoral approach in three tiers based on: fuel combustion from national energy statistics and default emission factors, together with country-specific emission factors, and fuel statistics and data on combustion technologies applied together with technology-specific emission factors [5-8].
This included the use of models and facility level emission data where available.
With the data provided by LQDX cement plant, in May 2010 the clinker was 5560 ton per day in average, the results are as follows
(9) Compared to APP estimated average data which is 0.87 ton CO2 per ton clinker, this paper gave the result of 0.822 ton CO2 per ton clinker for LQDX cement plant.
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