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Online since: December 2010
Authors: Sang Hyun Nam, Hyun Do Yun, Young Jae Song, Sun Woo Kim
The data shows that the progress of the damage in HPFRCCs in the compressive mode is characteristic of the type of hybrid fiber and its volume fraction.
From the AE data, the second and third compressive load cycles resulted in a successive decrease in the amplitude compared to the first compressive load cycle.
Based on the analysis of the data from individual event signals stored in the AE measurement system, the decrease in AE peak amplitude generally corresponded to events having smaller ring-down counts and shorter duration times.
The Kaiser effect was confirmed from the large reduction in the AE peak amplitude observed during repetitive load cycles arising from the use of macrofibers that had a high Young’s modulus.
Therefore, we have shown that the use of hybrid fibers in cement composites can decrease the damage in the material due to the reduction in friction between the sliding contacts of the crack surfaces under cyclic loading.
Online since: January 2021
Authors: Patrick da Costa, Chang Wei Hu, Ye Wang, Yan Nan Wang
The literature data showed that nickel-based catalysts presented high activity in dry reforming of methane reaction [5-7].
The data were recorded by TCD from 100 °C to 900 °C.
The data was recorded from 50 °C to 900 °C.
Crystallite sizes of Ni0 determined by XRD after reduction at 700 °C for 1 hour and after reaction at 700 °C for 8 hours.
The content of Ni2+ determined by XPS after reduction and after reaction.
Online since: July 2018
Authors: Saiful Amri Mazlan, Ubaidillah Ubaidillah, Faishal Harish, Endra Dwi Purnomo, Ilham Bagus Wiranto, Dody Ariawan
The data was compared with simulation results.
Since the difference is insignificant, it can be said that the data is valid.
At the beginning and at the end of the chart the data has not convergent yet, but in the middle the data make a steady line.
To ensure the validity of the result from finite element analysis, the experimental data was compared to the simulation data.
Both validation data is taken at the wall casing and the difference is about 6-40 mT.
Online since: September 2016
Authors: S. Gopalakannan, R. Ilandjezian
Primarily because of their high specific strength and stiffness, these composite materials could also be used in Automobiles weight reduction and other applications.
This reduces the generation of greenhouse gases as they are produced during the bauxite processing and alumina reduction. 1.2 Stir Casting Method for Fabrication of MMC’s Fig.1 Stir casting setup Stir Casting is a liquid state method of composite materials fabrication, in which a dispersed phase (ceramic particles, short fibers) is mixed with a molten matrix metal by means of mechanical stirring.
The after tensile test area reduction percentage is 11% higher for microsphere based Al-MMC compared with fly ash based Al-MMC.
Table. 2 Tensile test result comparisons Load Vs Displacement data for Tensile test Data/Sample 5% Fly ash Al-MMC 5% Microsphere Al-MMC Ultimate Breaking Load (kN) 2.81 2.435 Displacement at F max (mm) 4.7 1.2 Maximum Displacement (mm) 5.6 2.5 Area of Cross Section (mm2) 29.62 30.203 Ultimate Stress (kN/mm2) 0.095 0.081 Elongation (%) 4.444 4.4829 Reduction in area (%) 10.769 12.188 Yield Stress (kN/mm2) 0.061 0.074 Yield Stress/ Ultimate tensile stress ratio 0.644 0.924 The yield stress withstanding capability is 17.5% higher in value for microsphere based Al-MMC compared with fly ash based Al-MMC.
The Compression test results of Al-MMC were done by Standard UTM tabulated below Table. 3 Compression test results comparison Load Vs Displacement data for Compression test Data/Sample 5% Fly ash Al-MMC 5% Microsphere Al-MMC Ultimate Breaking Load (kN) 22.63 26.5 Displacement at F max(mm) 4.3 6.7 Maximum Displacement(mm) 8.4 9.1 Area of Cross Section (mm2) 130.54 124.54 Ultimate Stress(kN/mm2) 0.17 0.212 5.
Online since: October 2013
Authors: Yu Zhuo Jia, Hai Hong Xi, Liang Zhang
For this, the Chinese standard Code for Design of Steel Structures (GB50017-2003) [1] is according to the formula of axial compression and introduced a coefficient η reduction on steel strength design values.
Shilun Shi and others [6] through the comprehensive experimental results with domestic and abroad relevant data, studied of one-sided bolt connecting single angle steel, put forward different calculation formula for different computing length interval.
So by using the large engineering finite element software ANSYS, carrying on the modeling from the common equilateral angle steel in 110kV, 220kV and 500kV transmission towers, and comparing with non-equilateral angle steel data to get replacement conditions.
Table 1 Comparison between experimental data and the simulation values Angle steel specification Length [mm] Yield strength [MPa] Experimental data [kN] Simulation values [kN] Errors L45×5 739 280 66 66.98 1.48% L56×5 990 280 77.6 79.8 2.84% L56×5 737 280 79.3 82.56 4.11% L110×7 3074 235 154.37 146.34 -5.2% L100×8 3543 345 129.54 137.74 6.33% The results of analysis Through to the modeling analysis of 23 kinds of equilateral angle steels and 23 kinds of non-equilateral angle steels (the long-side and short-side connection working condition should be considered), and comparing the results, due to space limitations, it gives some comparison charts [Fig. 6].
For example, when the length of L63×6 is shorter than 1215mm, the section area of L63×40×7 is smaller than L90×56×5 and the buckling force of L63×40×7 is higher, so in this range we’d better to choose L63×40×7. 4) Through more contrast, to obtain substitution table of angle steels that is shown in Table 2: Table 2 Substitution table of angle steels (parts) Original angle steels Replacement Length range[mm] Non-equilateral angle steels Connection method section area reduction [cm2] section area reduction [%] Weight reduction [kg/m] L50×5 (0,910] L70×45×4 L 0.25 5.21 0.19625 [2113,+∞) S L70×8 (0,1451] L75×50×8 L 1.2 11.25 0.942 (1451,1501] L80×50×8 L 0.8 7.5 0.628 L75×8 (0,1366] L80×50×8 L 1.63 14.17 1.27955 (1366,1541] L100×63×7 L 0.4 3.48 0.314 (1541,1661] L90×56×8 L 0.3 2.61 0.2355 L80×6 (0,1137] L70×45×7 L 1.74 18.51 1.3659 (1137,1309] L90×56×6 L 0.84 8.94 0.6594 (1309,1425] L80×50×7 L 0.68 7.23 0.5338 L80×7 (L,1472] L75×50×8 L 1.39 12.8 1.09115 L80×8 (L,1381] L100×63×7 L 1.2
Online since: October 2003
Authors: Peter Lundmark, Janis Varna
A limited number of experimental data are presented and used for further verification.
Reduction in elastic properties due the cracks in layers of [0,90]s laminate.
FEM model Ex/Ex0 0.9179 0.9162 Ey/Ey0 0.9106 0.9072 vxy/vxy0 0.8075 0.8195 vyx/vyx0 0.8010 0.8200 ααααx/ααααx0 0.9573 0.9576 ααααy/ααααy0 0.9539 0.9534 Comparison with experimental data The predictive model was applied to experimental Young's modulus and Poisson's ratio data for cross-ply laminates.
Experimental data of reduction of both stiffness and Poisson's ratio in GF/EP [02,902]s cross-ply laminates compared with model predictions.
Transverse cracking and stiffness reduction in composite laminates.
Online since: April 2013
Authors: Shao Yi Wu, Min Quan Kuang, Bo Tao Song, Xian Fen Hu
H denotes the reduction factor for the Cu2+ 3d-3s (and -4s) orbital admixture due to tetragonal distortion [15].
The structural data of this site are illustrated as the two bond lengths R|| ≈ 2.721 Å parallel to the C4 (horizontal c) axis and four bond lengths R^ ≈ 1.931 Å perpendicular to the C4 axis (vertical a and b axes) [19].
Substituting these data into Eqs. (1) and (5), the g factors, hyperfine structure constants and Knight shifts are calculated and given in Table 1.
Table 1 The g factors, hyperfine structure constants (in 10–4 cm–1) and Knight shifts (in %) for Tl2Ba2CuO6+y g// g^ A// A^ K// K^ Calc. 2.23 2.04 –121.07 –22.46 1.29 0.23 Expt. [11] - - –120.31 –22.56 1.27 0.25(1) Discussion It can be found from Table 1 that the theoretical Knight shifts and hyperfine structure constants obtained from the high order perturbation formulas agree well with the experimental data.
Karwowski, Handbook of Atomic Data, Elsevier Press, New York, 1976.
Online since: June 2013
Authors: Peng Jie Chu, Shi Ping Xie
Hanging transportation has been listed in the "ten key projects" to promote energy saving and emission reduction.
According to data announced by the Department of Transportation, the annual one-way passing capability through the three gorges dam is 50 million tons and two-way 100 million tons, each lock operates with daily average of 22 times.
According to the statistics data of lock passing by the maritime administration department of the three gorges, in the only half a year of 2003, the passing volume through the three gorges is 13.7701 million tons, in 2004 34.3062 million tons, in 2009 increased to 60.8873 million tons and in 2010 the lock is operated 9407 times, 58302 ships and 507500 passengers passing through, freight volume of 87.94 million tons including 78.8 million tons of transported cargo and 9.14 million tons of Over-Dam transshipment goods, increasing 18.44% comparatively year-on-year and making a new record.
A statistical data of heavy cargo transportation over years shows that heavy goods transport restricted by bridges or tunnels on railway and highway usually take waterway Ro-Ro transportation as a preference.
A market research data of transport vehicles along the Reservoir shows: commercial bulk alcohol is carried out of Sichuan, Guizhou, Chongqing, and other provinces and cities as much as 30-400000 tons by nearly 20000 transport vehicles.
Online since: August 2014
Authors: Gui Shu Yin, Yan Xue, Jing Chen
And energy saving adapts to the international form of low carbon and emission reduction.
Energy saving plays an important role in emission reduction[2].
And the excess steam is removed in time when the flow of the demineralized water suddenly becomes low. 4 Data Sources and Transformation Results The data of this study is got mainly from production and operation data of field engineering. 4.1 Determination of Energy Efficiency. 1) After the implementation of the project, energy saving benefit (△C) refers to the sum of all kinds of energy saving multiplied by energy unit price.
Energy saving data is calculated by equation 1.
Transformation of Energy Saving and Emission Reduction of Coal Chemical Enterprises Based on Circular Economy[D].
Online since: August 2013
Authors: Ning Lu, Xin Wei Liao, Chang Lin Liao, Huang Wang, Meng Meng Li, Yu Li Lv
The EOR mechanism of CO2 flooding CO2 EOR mechanism is mainly reflected in the following aspects: (1) viscosity reduction, the viscosity of crude oil dropped significantly when CO2 dissolved in it.
Generally, the higher the original viscosity of crude oil, the higher the percentage of viscosity reduction.
The viscosity of crude oil can be reduced to the 1/10-1/100 of original one. (2) improve oil-water mobility ratio, a large amount of CO2 dissolved in the crude oil and water, the viscosity of crude oil reduced and water viscosity increased by 20% after carbonation, so that the mobility ratio of water and oil is improved and the swept volume can be expanded. (3) oil expansion, when CO2 comes into contact with crude oil a process of dissolution occurs thereby causing swelling, it usually can expanded 10%-100% of original volume. (4) solution gas drive, with the reduction of reservoir pressure, the dissolved CO2 gas escapes from the crude oil to generate a driving force and to improve the oil displacement effect [6]. (5) interfacial tension reduction, CO2 evaporation and dissolution effects will generate ultra-low interfacial tension, the ultra-low interfacial tension is an important factor for EOR [7]. (6) CO2-assisted gravity drainage, in addition to the above flooding mechanism, another
PR3 equation of state is applied in PVT regression via PVTi module of Eclipse 2010 to match the experimental data of single flash vaporization test, multi-degas test and constant composition expansion test.
A 2D compositional numerical model is established based on the above geological data, PVT data and relative permeability data.
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