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Online since: August 2007
Authors: William H. Peter, G.Y. Wang, R.A. Buchanan, C.T. Liu, M.L. Morrison, C.R. Brooks, Peter K. Liaw
A comparison between these results and the existing data for conventional high-strength alloys with
various surface finishes was difficult since the majority of studies found were performed in the
1930s through the 1950s, using common finishing techniques of the time.
One reference reported reductions in fatigue-endurance limits for comparable finishes of high-strength steels [15].
A general observation is that the reduction is greater for the materials with higher tensile strengths.
Comparing the stress-range/fatigue-life data of notched BMG-11 specimens tested in air with various finishes.
Reduction of fatigue-endurance limit for conventional, high-strength steels, and BMG-11.
One reference reported reductions in fatigue-endurance limits for comparable finishes of high-strength steels [15].
A general observation is that the reduction is greater for the materials with higher tensile strengths.
Comparing the stress-range/fatigue-life data of notched BMG-11 specimens tested in air with various finishes.
Reduction of fatigue-endurance limit for conventional, high-strength steels, and BMG-11.
Online since: January 2016
Authors: Sergio Lorenzi, Stefano Garlati, Patricia Kara, Luigi Coppola
PNH1 in combination with NSF improved workability retention with respect to pure NSF, but caused a reduction in the early compressive strength when the dosage exceeded 0.10% (dry polymer vs. cement mass).
The latter are more effective in terms of both water reduction and workability retention as a consequence of a different dispersion mechanism [1,2].
The effect could be explained by considering the intrinsic lower effectiveness in terms of water reduction of pure phosphonate with respect to pure NSF and PCE.
In the case of CEM II/A-LL 42.5R data indicate poor workability retention for both blended PNH1-PNH2/PCE admixtures in comparison with the pure PCE (Fig. 4a).
Finally, lower superplasticizer/cement compatibility, as confirmed by data scattering, was detected for PNH2/PCEs superplasticizers.
The latter are more effective in terms of both water reduction and workability retention as a consequence of a different dispersion mechanism [1,2].
The effect could be explained by considering the intrinsic lower effectiveness in terms of water reduction of pure phosphonate with respect to pure NSF and PCE.
In the case of CEM II/A-LL 42.5R data indicate poor workability retention for both blended PNH1-PNH2/PCE admixtures in comparison with the pure PCE (Fig. 4a).
Finally, lower superplasticizer/cement compatibility, as confirmed by data scattering, was detected for PNH2/PCEs superplasticizers.
Online since: June 2021
Authors: Young Rae Cho, Ye Jin Kim, Young Min Kim, Sung Hyuk Park
Introduction
Weight reduction of automotive components is the most effective approach for reducing the carbon dioxide emissions of automobiles and improving their fuel efficiency.
Fig. 5 shows the fatigue data and S–N curves of the strips.
In the stress regime with finite fatigue life, the scatter of data obtained at a given stress level is not large in any of the strips, despite the large deviation in the tensile elongation of the 3-mm-thick strip (Fig. 5a–c).
With an increase in the strip thickness, their fatigue strength gradually decreases because of the reduction in their yield strength.
These results demonstrate that the yield strength, tensile ductility, and fatigue strength of the TRC AZ31 alloy strips improve simultaneously with decreasing strip thickness because of the reduction in the DRXed grain size.
Fig. 5 shows the fatigue data and S–N curves of the strips.
In the stress regime with finite fatigue life, the scatter of data obtained at a given stress level is not large in any of the strips, despite the large deviation in the tensile elongation of the 3-mm-thick strip (Fig. 5a–c).
With an increase in the strip thickness, their fatigue strength gradually decreases because of the reduction in their yield strength.
These results demonstrate that the yield strength, tensile ductility, and fatigue strength of the TRC AZ31 alloy strips improve simultaneously with decreasing strip thickness because of the reduction in the DRXed grain size.
Online since: March 2017
Authors: Sang Woo Lee, Ki Sang Park, Byung Man Chae, Deuk Hyeon Kim, A Ra Go, Sung Ok Hwang
A study on the refining of nickel sulfate solution from sulfuric acid leached solution of spent lithium ion battery and fabrication of nickel nanopowders from the nickel sulfate solution was investigated. the nickel sulfate solution with high purity(>99.9%) was refined by precipitation method and solvent extraction method. the nickel nanopowders were synthesized by liquid phase reduction method with hydrazine and sodium hydroxide. the purity of nickel sulfate solution and nickel nanopowders were measured by EDTA(ethylenediaminetetraacetic) titration method with ICP-OES (inductively coupled plasma optical emission spectrometer). morphology, particle size and crystal structure of the nickel nanopowder was observed using transmission electron microscopy and x-ray diffraction spectroscopy.
To carry out the liquid phase reduction, 400g of 30 wt% NaOH solution was added and maintained 70℃ of temperature and 400 rpm of stirring rate using hotplate and overhead stirrer.
Figure 4 shows The XRD pattern of the fabricated nickel nanopowder. from the data, the crystal structure of the nickel nanopowder was FCC[3].
Nickel nanopowder was fabricated by liquid phase reduction from the fabricated nickel sulfate solution.
To carry out the liquid phase reduction, 400g of 30 wt% NaOH solution was added and maintained 70℃ of temperature and 400 rpm of stirring rate using hotplate and overhead stirrer.
Figure 4 shows The XRD pattern of the fabricated nickel nanopowder. from the data, the crystal structure of the nickel nanopowder was FCC[3].
Nickel nanopowder was fabricated by liquid phase reduction from the fabricated nickel sulfate solution.
Online since: June 2018
Authors: Min Seok Kang, Bong Mook Lee, Veena Misra
This improvement can be attributed to the effective removal of unreacted metal-organic precursors, active traps, and broken bonds in the ALD SiO2 dielectrics as well as reduction in interface state density at SiC/SiO2 interface.
It is well known that the subthreshold swing is directly related to the interface state density [9] so the steep slope obtained from the Sample #5 indicates the reduction of interface state density at the SiC/SiO2 interface resulting in the enhancement of the channel mobility.
These improvements can be explained by the fact that the multiple deposition with multiple anneal effectively suppresses electron traps by removing unreacted metal-organic precursors from the SiO2 ALD process as well as passivates SiC/SiO2 interface resulting in the reduction interface trap density (Dit).
The information, data, or work presented herein was funded in part by the Office of Energy Efficiency and Renewable Energy (EERE), U.S.
It is well known that the subthreshold swing is directly related to the interface state density [9] so the steep slope obtained from the Sample #5 indicates the reduction of interface state density at the SiC/SiO2 interface resulting in the enhancement of the channel mobility.
These improvements can be explained by the fact that the multiple deposition with multiple anneal effectively suppresses electron traps by removing unreacted metal-organic precursors from the SiO2 ALD process as well as passivates SiC/SiO2 interface resulting in the reduction interface trap density (Dit).
The information, data, or work presented herein was funded in part by the Office of Energy Efficiency and Renewable Energy (EERE), U.S.
Online since: September 2013
Authors: Fa Hua Li, Zhong Xu Dai, Dan Liu, Dan Wei Pi, Quan Bin Liao
Then, energy conservation and emissions reduction can be achieved when the technological process is used.
It is not only a big loss to the manufacturers, also is not in conformity with the green chemical "reduce material consumption, waste reduction, recycling and harmless" in today's advocates of globalization green economy background[1-3].
In order to make full use of waste, energy conservation and emissions reduction, and achieve the unity of the economic benefits, social benefits and environmental benefits [5], sodium acetate has been separated and recycled in waste liquid from production by the process of precipitation, filtration, washing, concentration, crystallization and recrystallization and drying.
Figure 1, The separation process of sodium acetate Table 1, The testing indicators of sodium acetate tri-hydrate samples The test items Testing data GB/T 693-1996 Chemically pure standard CH3COONa·3H2O, [%] 98.5 ~ 99 ≥ 98.0 pH( 50 g/L, 25℃) 7.8 ~ 8.3 7.5 ~ 9.0 Clarity test qualified qualified Water-insoluble, [%] 0.003 ~ 0.005 ≤ 0.005 Chloride (C1-), [%] 0.0023 ~ 0.0029 ≤ 0.003 Sulfate (SO42-), [%] 0.0044 ~ 0.0050 ≤ 0.005 Phosphate [PO43-), [%] 0.0003 ~ 0.0005 ≤ 0.0005 Al3+, [%] 0.0008 ~ 0.0010 ≤ 0.001 Ca2+, [%] 0.0035 ~ 0.005 ≤ 0.005 Fe2+, [%] 0.0003 ~ 0.0005 ≤ 0.0005 Cu2+, [%] 0.0007 ~ 0.0009 ≤ 0.001 Pb2+, [%] 0.0009 ~ 0.0010 ≤0.001 In the mother liquor, the content of organic colored impurity was less.
It is not only a big loss to the manufacturers, also is not in conformity with the green chemical "reduce material consumption, waste reduction, recycling and harmless" in today's advocates of globalization green economy background[1-3].
In order to make full use of waste, energy conservation and emissions reduction, and achieve the unity of the economic benefits, social benefits and environmental benefits [5], sodium acetate has been separated and recycled in waste liquid from production by the process of precipitation, filtration, washing, concentration, crystallization and recrystallization and drying.
Figure 1, The separation process of sodium acetate Table 1, The testing indicators of sodium acetate tri-hydrate samples The test items Testing data GB/T 693-1996 Chemically pure standard CH3COONa·3H2O, [%] 98.5 ~ 99 ≥ 98.0 pH( 50 g/L, 25℃) 7.8 ~ 8.3 7.5 ~ 9.0 Clarity test qualified qualified Water-insoluble, [%] 0.003 ~ 0.005 ≤ 0.005 Chloride (C1-), [%] 0.0023 ~ 0.0029 ≤ 0.003 Sulfate (SO42-), [%] 0.0044 ~ 0.0050 ≤ 0.005 Phosphate [PO43-), [%] 0.0003 ~ 0.0005 ≤ 0.0005 Al3+, [%] 0.0008 ~ 0.0010 ≤ 0.001 Ca2+, [%] 0.0035 ~ 0.005 ≤ 0.005 Fe2+, [%] 0.0003 ~ 0.0005 ≤ 0.0005 Cu2+, [%] 0.0007 ~ 0.0009 ≤ 0.001 Pb2+, [%] 0.0009 ~ 0.0010 ≤0.001 In the mother liquor, the content of organic colored impurity was less.
Online since: March 2014
Authors: B. Narayanamoorthy, S. Balaji
The average Pt particle size was found to be less than 15 nm which is calculated from XRD data.
Table 1 Comparison of EIS data for Nafion: PEG nanocomposite film at different composition in with pure Nafion film.
RHE and the Pt-O(H) formation and reduction were observed at 0.7 V and 0.6 V respectively.
Balaji, Improved oxygen reduction reaction catalyzed by pt/clay/Nafion nanocomposite for PEM fuel cells, ACS Appl.
Watanabe, Oxygen reduction at the Pt/carbon black-polyimide ionomer interface, J.
Table 1 Comparison of EIS data for Nafion: PEG nanocomposite film at different composition in with pure Nafion film.
RHE and the Pt-O(H) formation and reduction were observed at 0.7 V and 0.6 V respectively.
Balaji, Improved oxygen reduction reaction catalyzed by pt/clay/Nafion nanocomposite for PEM fuel cells, ACS Appl.
Watanabe, Oxygen reduction at the Pt/carbon black-polyimide ionomer interface, J.
Online since: June 2013
Authors: Guo Lai Yang, Yan Zhao, Ming Qiu, Jun Bo Xiao
Junzheng Huang, et al [1] came up with bond graph theory to establish the model of buffering movement of overall gun to get the best way of recoil reduction by comparing three different buffers.
(2) Based on the simulation in ADAMS software and the installation of muzzle brake and the original spring buffer, this paper can get the data that the maximum displacement x is 9.32mm, the maximum recoil is 37686N.
Calculations suggest that although the original chain gun installs a high-efficiency brake, the effect of recoil reduction is not satisfactory because of the original spring buffer
The effect of recoil reduction with simple structure can be realized easily.
Research results can provide theoretical guidance and reference for continuation study of chain gun recoil reduction.
(2) Based on the simulation in ADAMS software and the installation of muzzle brake and the original spring buffer, this paper can get the data that the maximum displacement x is 9.32mm, the maximum recoil is 37686N.
Calculations suggest that although the original chain gun installs a high-efficiency brake, the effect of recoil reduction is not satisfactory because of the original spring buffer
The effect of recoil reduction with simple structure can be realized easily.
Research results can provide theoretical guidance and reference for continuation study of chain gun recoil reduction.
Online since: October 2013
Authors: Qin Liu, Xiao Na Zhang
Based on regression analysis of test data, the formulas for estimating the shrinkage deformation of recycled coarse aggregates concrete are given out, which provide the basis for engineering applications.
With zero growth period, the cement hydration gradually slowed, and pre-hydration resulting hydrate filled pore structure, allowing cement increased compactness, porosity reduction, hydration shrinkage decreases [3].
Because the volume of hardened cement paste is not stable when the relative humidity of external environment is less than 100%, the cement paste will be dehydration, and will be volume reduction [3].
According to experimental data, regression analysis, shrinkage estimation formulas are obtained under different curing conditions in the natural strength grade 100% of recycled coarse aggregate concrete.
Based on regression analysis of test data, the formulas for estimating the shrinkage of recycled coarse aggregate concrete cured in natural environment are given out to provide the basis for engineering applications.
With zero growth period, the cement hydration gradually slowed, and pre-hydration resulting hydrate filled pore structure, allowing cement increased compactness, porosity reduction, hydration shrinkage decreases [3].
Because the volume of hardened cement paste is not stable when the relative humidity of external environment is less than 100%, the cement paste will be dehydration, and will be volume reduction [3].
According to experimental data, regression analysis, shrinkage estimation formulas are obtained under different curing conditions in the natural strength grade 100% of recycled coarse aggregate concrete.
Based on regression analysis of test data, the formulas for estimating the shrinkage of recycled coarse aggregate concrete cured in natural environment are given out to provide the basis for engineering applications.
Online since: September 2013
Authors: Chun Liang Chen, Chan Wei Hsu
Cubic spine and linear Kalman filter are applied to curve fitting and estimation for data size reduction.
Under data collecting demand, we had established some outstanding technology in mobile data surveillance system.
Through Internet, the reporting data will be collected onto ARTC server for further data mining.
The storage data in SD card will be record alternatively, and OBU will transmit recorded data when communication slot is available.
This concept can reduce data size in desired interval with possible data lost cases.
Under data collecting demand, we had established some outstanding technology in mobile data surveillance system.
Through Internet, the reporting data will be collected onto ARTC server for further data mining.
The storage data in SD card will be record alternatively, and OBU will transmit recorded data when communication slot is available.
This concept can reduce data size in desired interval with possible data lost cases.