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Online since: October 2006
Authors: Emanuele Serra, Marco Alvisi, Giovanna Galtieri, R. Giorgi, Tiziana Di Luccio, L. Giorgi
For lower loading only a work [8]
reports data concerning platinum clusters with 0.03 mg/cm-2 platinum loading without showing the
x-ray curves of low loading catalyzed electrodes.
The peak width of the as-deposited platinum clusters indicates that a surface oxidation should be considered, whose reduction after MOR is revealed by the prevailing of the metallic character.
The behavior of NF9CS vs MOR cycles correlated to the SEM, XPS and XRD characterization suggests that the increase in activity of the catalyst comes from the reduction of the adsorbed oxide products on the cluster surface; this phenomenon seems to prevail on the surface area reduction due to the doubling of the grain and domain size.
The peak width of the as-deposited platinum clusters indicates that a surface oxidation should be considered, whose reduction after MOR is revealed by the prevailing of the metallic character.
The behavior of NF9CS vs MOR cycles correlated to the SEM, XPS and XRD characterization suggests that the increase in activity of the catalyst comes from the reduction of the adsorbed oxide products on the cluster surface; this phenomenon seems to prevail on the surface area reduction due to the doubling of the grain and domain size.
Online since: February 2022
Authors: Renat V. Gavariev, Ksenia N. Gavarieva
The main reason is the absence of a significant reduction in the chemical processes between the melt and the mold.
Heat treatment provides an increase in mechanical properties and a reduction in the level of internal stresses.
In [21], data on the use of two modes of heat treatment of the Ml5 alloy are presented.
Savin, Calculation of the amount of the reduction required for the formation of compound layers during cold rolling of bimetals, Materials Science Forum. 870 (2016) 328-333
Heat treatment provides an increase in mechanical properties and a reduction in the level of internal stresses.
In [21], data on the use of two modes of heat treatment of the Ml5 alloy are presented.
Savin, Calculation of the amount of the reduction required for the formation of compound layers during cold rolling of bimetals, Materials Science Forum. 870 (2016) 328-333
Online since: August 2015
Authors: R.D. Knutsen, J.E. Westraadt, V.N. Vilane
The EBSD data was presented as an overlay of band contrast and greyscale phase maps where phase, morphology and grain misorientation information could be extracted.
The 294MPa (±30MPa) reduction in fracture strength when comparing THP-MD and control 2 samples can no longer be attributed to acicular morphology.
The crux behind the 300MPa strength reduction is highlighted in Fig. 4b).
The acicular component of the bimodal morphology caused a 30% reduction in ductility.
The 294MPa (±30MPa) reduction in fracture strength when comparing THP-MD and control 2 samples can no longer be attributed to acicular morphology.
The crux behind the 300MPa strength reduction is highlighted in Fig. 4b).
The acicular component of the bimodal morphology caused a 30% reduction in ductility.
Online since: June 2008
Authors: António Torres Marques, A.G. Magalhães, Luís Miguel P. Durão, A.M. Baptista, M. Figueiredo
The importance of tool geometry in delamination reduction is evidenced by several published
papers on the subject.
Finally, Tsao [8] evaluated the importance of pilot hole on delamination reduction when using core drills.
During drilling, axial thrust force (Fz) was monitored with a Kistler 4782 dynamometer associated to a multichannel amplifier and data collected for a PC.
Another point to remind is the difference between these results and the average results obtained for glass/epoxy and carbon/epoxy plates, denoting the good compression properties of laminates that use glass fibre as reinforcement. 1.07 1.08 1.09 1.10 1.11 1.12 Brad Twist Step Damage ratio [D RAT ] Drill Conclusions Hybrid laminates can be a good alternative to monolithic carbon/epoxy laminates when cost reduction issues are concerned.
Finally, Tsao [8] evaluated the importance of pilot hole on delamination reduction when using core drills.
During drilling, axial thrust force (Fz) was monitored with a Kistler 4782 dynamometer associated to a multichannel amplifier and data collected for a PC.
Another point to remind is the difference between these results and the average results obtained for glass/epoxy and carbon/epoxy plates, denoting the good compression properties of laminates that use glass fibre as reinforcement. 1.07 1.08 1.09 1.10 1.11 1.12 Brad Twist Step Damage ratio [D RAT ] Drill Conclusions Hybrid laminates can be a good alternative to monolithic carbon/epoxy laminates when cost reduction issues are concerned.
Online since: May 2011
Authors: Tie Jun Zhao, Xiao Mei Wan, Wei Qun Cao, Hong Fan
It is indicated that, reliablity index declines with time and the decline trend is characterized as reduction with time.
It can be interpreted by the mechanism of reduction with time of effective diffusion coefficent of CO2.
It is also obviously that the relaibility index increases with the mean value of concrete cover and the reduction trend of declination of the relaibility index decrease with the standard diviation of concrete cover.
The model and the corresponding service life prediction method need to be improved and verified by more data from practical engineering and compliance tests.
It can be interpreted by the mechanism of reduction with time of effective diffusion coefficent of CO2.
It is also obviously that the relaibility index increases with the mean value of concrete cover and the reduction trend of declination of the relaibility index decrease with the standard diviation of concrete cover.
The model and the corresponding service life prediction method need to be improved and verified by more data from practical engineering and compliance tests.
Online since: October 2010
Authors: Li Zhi Gu, Qi Hong, Xiao Hui Yu
Introduction
Future international manufacturing is no longer the competition of the capital, resources and labor
power, but the competition of green technology, then energy saving and emission reduction will
become the dominant trend of the upgrade of manufacturing industry.
On the basis of traditional processing technics, green processing technics is an advanced mechanical processing technics aiming at the rational use of resources, cost saving, reduction of environmental pollution, etc., and combined with the material science, surface technology, control technology and other new technologies [2].
The subject constructed the standard system framework of near net shape forming, explored a new type of standardized methods, established eight national standards and industrial standards, constructed a basic database including the data from the research achievements of 14 sub-items, put forward the development planning of the near net shape forming technology in China, and clarified the development direction and the key issues needed to be resolved of near net shape forming.
It is necessary to carry out green manufacturing in the manufacturing sector to realize energy conservation, improvement of efficiency and reduction of production waste based on the progress of science and technology, and the green manufacturing technology is also a major project in the field of manufacturing belonged to the National Plan for the Development of Science and Technology of the "11th Five-year Plan".
On the basis of traditional processing technics, green processing technics is an advanced mechanical processing technics aiming at the rational use of resources, cost saving, reduction of environmental pollution, etc., and combined with the material science, surface technology, control technology and other new technologies [2].
The subject constructed the standard system framework of near net shape forming, explored a new type of standardized methods, established eight national standards and industrial standards, constructed a basic database including the data from the research achievements of 14 sub-items, put forward the development planning of the near net shape forming technology in China, and clarified the development direction and the key issues needed to be resolved of near net shape forming.
It is necessary to carry out green manufacturing in the manufacturing sector to realize energy conservation, improvement of efficiency and reduction of production waste based on the progress of science and technology, and the green manufacturing technology is also a major project in the field of manufacturing belonged to the National Plan for the Development of Science and Technology of the "11th Five-year Plan".
Online since: December 2012
Authors: Jun Song Jin, Xin Yun Wang, Ju Chen Xia, Lei Deng, Da Li
The Young’s Modulus of 70 Gpa, Poisson’s ratio of 0.31, and constitutive relationship were derived from tensile test data.
After stamping-forging the residual stress reduction is all more than 60%.
It is suggested that we can achieve zero springback by changing the upsetting reduction, which has a positive significance on the control of dimensional accuracy in forming process of plate parts.
In addition, the negative springback was appeared after upsetting, which provides a suggestion for the study of changing the upsetting reduction to adjust the springback compensation, even to achieve the zero springback.
After stamping-forging the residual stress reduction is all more than 60%.
It is suggested that we can achieve zero springback by changing the upsetting reduction, which has a positive significance on the control of dimensional accuracy in forming process of plate parts.
In addition, the negative springback was appeared after upsetting, which provides a suggestion for the study of changing the upsetting reduction to adjust the springback compensation, even to achieve the zero springback.
Online since: June 2014
Authors: N. Hari Babu, Magdalena Nowak, Leandro Bolzoni
Aluminium and its alloys are the material of choice when the reduction of weight has to be combined with other specific properties such as good corrosion resistance and appropriate mechanical properties at relatively low performing temperatures.
Analysing the data relative to the binary Al-xSi without addition of the NGR and poured from constant temperature of 700ºC (square dots), it is confirmed that the addition of silicon to aluminium leads to the refinement of the grain structure (i.e. binary Al-4Si ~ 580 µm).
In the case of the binary Al-xSi alloys without the addition of the NGR poured from a constant superheat (round dots) and, accordingly, lowering the pouring temperature proportionally to the increment of the silicon content, after the drastic grain size reduction of the binary Al-4Si alloy, there is a slight grain coarsening with the increment of the silicon content reaching the coarsest grain size for the binary Al-10Si alloy (~ 650 µm).
The reduction of the length of the eutectic needles and of the primary silicon particles is thought to be due the more homogeneous distribution of silicon atoms in the solidification front and in the molten metal pools which remain in between the arms of the dendrite growing during the solidification process.
Analysing the data relative to the binary Al-xSi without addition of the NGR and poured from constant temperature of 700ºC (square dots), it is confirmed that the addition of silicon to aluminium leads to the refinement of the grain structure (i.e. binary Al-4Si ~ 580 µm).
In the case of the binary Al-xSi alloys without the addition of the NGR poured from a constant superheat (round dots) and, accordingly, lowering the pouring temperature proportionally to the increment of the silicon content, after the drastic grain size reduction of the binary Al-4Si alloy, there is a slight grain coarsening with the increment of the silicon content reaching the coarsest grain size for the binary Al-10Si alloy (~ 650 µm).
The reduction of the length of the eutectic needles and of the primary silicon particles is thought to be due the more homogeneous distribution of silicon atoms in the solidification front and in the molten metal pools which remain in between the arms of the dendrite growing during the solidification process.
The Effect of Blast Exposure Distance on Hardness and Reduced Modulus Properties of Lead-Free Solder
Online since: May 2021
Authors: Ariffin Ismail, Azman Jalar, Wan Yusmawati Wan Yusoff, Norliza Ismail, Maria Abu Bakar, Nur Shafiqa Safee
This matter must be considered because the important data inside the device must be known by the soldier even though the device totally broke by the explosion.
The reduction in the hardness obtained is in line with the results of the indentation depth which indicates that the solder material is softening after exposure to blast test.
Bakar et al. [14] has reported that SAC 305 solder joints also experience softening with a reduction in hardness after 1000 hours of high temperature storage.
The degradation of hardness properties was correlated with the coarsening effect which reduced the resistance of the solders to the dislocation and automatically caused a reduction in hardness values.
The reduction in the hardness obtained is in line with the results of the indentation depth which indicates that the solder material is softening after exposure to blast test.
Bakar et al. [14] has reported that SAC 305 solder joints also experience softening with a reduction in hardness after 1000 hours of high temperature storage.
The degradation of hardness properties was correlated with the coarsening effect which reduced the resistance of the solders to the dislocation and automatically caused a reduction in hardness values.
Online since: September 2016
Authors: Lucile Broussous, Matthieu Lépinay, Benoit Coasne, Christophe Licitra, François Bertin, Vincent Rouessac, André Ayral
However pore size reduction at the surface was not evidenced.
Adsorption isotherms were simulated then used in the treatment of experimental EP data with the Micropore Model (MP method), leading in a differentiation of sample pore size depending on the considered surface chemistry after etching and cleaning.
Thus, after diluted HF cleaning, pore size reduction could be induced by dangling bond re-organisation and Si-O-Si bridge formation during the wet clean with diluted HF (Si–OH condensation).
Indeed, very small variations in the range of 0.3 nm are consistent with a reduction of the distance between two adjascent Si atoms in silica network during Si-OH condensation (Figure 9), as reported in the literature [21].
Adsorption isotherms were simulated then used in the treatment of experimental EP data with the Micropore Model (MP method), leading in a differentiation of sample pore size depending on the considered surface chemistry after etching and cleaning.
Thus, after diluted HF cleaning, pore size reduction could be induced by dangling bond re-organisation and Si-O-Si bridge formation during the wet clean with diluted HF (Si–OH condensation).
Indeed, very small variations in the range of 0.3 nm are consistent with a reduction of the distance between two adjascent Si atoms in silica network during Si-OH condensation (Figure 9), as reported in the literature [21].