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Online since: April 2016
Authors: Lutz Krüger, Marcel Mandel, Volodymyr Kietov
Introduction
High-alloy stainless steels enjoy a wide field of application due to their excellent mechanical properties, which are accompanied by adequate corrosion behaviour in the most aggressive environments due to the formation of a dense and stable passive oxide [1-5].
In metastable austenitic steels, a martensitic phase is formed when a mechanical load is applied, which can further improve the mechanical characteristics [6, 7].
As a common factor in most studies, it is stated that the AE signal may, in general, be attributed to the release of gas bubbles due to hydrogen or oxygen formation at the electrode.
For t > 0.75 s, it was assumed that the reduction in the current-time relation was strongly affected by O2 bubble formation and growth.
In metastable austenitic steels, a martensitic phase is formed when a mechanical load is applied, which can further improve the mechanical characteristics [6, 7].
As a common factor in most studies, it is stated that the AE signal may, in general, be attributed to the release of gas bubbles due to hydrogen or oxygen formation at the electrode.
For t > 0.75 s, it was assumed that the reduction in the current-time relation was strongly affected by O2 bubble formation and growth.
Online since: July 2014
Authors: R.H. Biswas
TL level therefore is most strongly affected at perihelion.
Titulaer, Luminescence, electron paramagnetic resonance, and optical properties of lunar material.
Rhodes, OSL properties of NaCl relative to dating and dosimetry.
Aitken, Dose-rate conversion factors: update.
Stokes, Red luminescence from potassium feldspar for dating applications: A study of some properties relevant for dating.
Titulaer, Luminescence, electron paramagnetic resonance, and optical properties of lunar material.
Rhodes, OSL properties of NaCl relative to dating and dosimetry.
Aitken, Dose-rate conversion factors: update.
Stokes, Red luminescence from potassium feldspar for dating applications: A study of some properties relevant for dating.
Online since: January 2013
Authors: Thanasis Triantafillou, Catherine Corina G. Papanicolaou
The quantity and the spacing of rovings in each direction can be independently controlled, thus affecting the mechanical characteristics of the textile and the degree of penetration of the mortar matrix through the mesh openings.
The latter is a measure of the composite action achieved for the mortar-grid structure through mechanical interlock.
This confirms the fact that the shear strengthening scheme selected in this study did not affect the flexural resistance.
Again, the use of polymer coating allowed for the full exploitation of the fibrous reinforcement’s mechanical properties.
Papantoniou, Mechanical behavior of textile reinforced concrete (TRC)/concrete composite elements, J.
The latter is a measure of the composite action achieved for the mortar-grid structure through mechanical interlock.
This confirms the fact that the shear strengthening scheme selected in this study did not affect the flexural resistance.
Again, the use of polymer coating allowed for the full exploitation of the fibrous reinforcement’s mechanical properties.
Papantoniou, Mechanical behavior of textile reinforced concrete (TRC)/concrete composite elements, J.
Online since: October 2014
Authors: Ke Sheng Wang
The WT’s superior time-localization properties stem from the finite support of the analysis wavelet: as b increases, the analysis wavelet transverses the length of the input signal, and a increases or decreases in response to changes in the signal’s local time and frequency content.
Therefore, the WPT have the same frequency bandwidths in each resolution and DWT does not have this property.
The frequency properties for every sub-signal could be very useful to judge the component condition, and thus the FFT is selected to get these kinds of information.
So the changing of the number of hidden layer nodes does not affect the accuracy of the output.
Mechanical Systems and Signal Processing, 19(2), 329-339, (2005)
Therefore, the WPT have the same frequency bandwidths in each resolution and DWT does not have this property.
The frequency properties for every sub-signal could be very useful to judge the component condition, and thus the FFT is selected to get these kinds of information.
So the changing of the number of hidden layer nodes does not affect the accuracy of the output.
Mechanical Systems and Signal Processing, 19(2), 329-339, (2005)
Online since: July 2024
Authors: Melvin Mununuri Mashingaidze
Pb is known to impact kidney functions, cardiovascular and reproductive health among other things, whereas Hg also affects the brain in addition to the former impacts [28].
The emissions intensity of CFPPs in South Africa far exceeds those of China by a factor of 42.
This has subsequently affected several planned CFPP projects in SADC such as the long-planned 2,800 MW Sengwa CFPP in Zimbabwe (Zimbabwe’s energy policy still favouring coal over renewables, 2020).
Individual countries have to design unique energy transition strategies predicated on multiple techno-socio-economic factors [91,92].
This can destabilise the energy supply and precipitate massive job losses, necessitating huge financial compensation for affected workers, reskilling and redeployment among other necessary interventions [12].
The emissions intensity of CFPPs in South Africa far exceeds those of China by a factor of 42.
This has subsequently affected several planned CFPP projects in SADC such as the long-planned 2,800 MW Sengwa CFPP in Zimbabwe (Zimbabwe’s energy policy still favouring coal over renewables, 2020).
Individual countries have to design unique energy transition strategies predicated on multiple techno-socio-economic factors [91,92].
This can destabilise the energy supply and precipitate massive job losses, necessitating huge financial compensation for affected workers, reskilling and redeployment among other necessary interventions [12].
Online since: March 2008
Authors: Valentin A. Tatarenko, Taras M. Radchenko, Helena Zapolsky
This is because of the advantageous high-temperature and corrosion properties
of alloys (in particular, Ti-Al intermetallic compound) are linked to the effect of long-range
ordering [1].
Intermetallic compounds based on alloys of the light elements, Ti and Al, are promising candidates for applications as high-temperature engineering materials due to some properties such as low density, high melting point, high strength and creep resistance, high oxidation resistance, low diffusion coefficients etc.
The Ti3Al phase is basic during the creation of industrial titanium materials and provides a beneficial effect for the mechanical properties of Ti-Al based alloys.
Figures 6a and 6b demonstrate how both the concentration and the annealing temperature affect the quantitative and qualitative changes of the kinetic and equilibrium paths.
According to Figs. 7a and 7b, the energy factor has a significant influence on the relaxation kinetics.
Intermetallic compounds based on alloys of the light elements, Ti and Al, are promising candidates for applications as high-temperature engineering materials due to some properties such as low density, high melting point, high strength and creep resistance, high oxidation resistance, low diffusion coefficients etc.
The Ti3Al phase is basic during the creation of industrial titanium materials and provides a beneficial effect for the mechanical properties of Ti-Al based alloys.
Figures 6a and 6b demonstrate how both the concentration and the annealing temperature affect the quantitative and qualitative changes of the kinetic and equilibrium paths.
According to Figs. 7a and 7b, the energy factor has a significant influence on the relaxation kinetics.
Online since: January 2016
Authors: Jarosław Sadowski, Krzysztof Cwalina, Piotr Rajchowski
MEMS (Micro Electro-Mechanical Systems).
One of them is a scale factor [1], defined as a linear deviation relative to the real value.
During research work, it was found that the method of mounting the measuring unit affects the accuracy of location estimation of a moving person.
This method has a property of sin(x) / x impulse response low-pass filter.
One of them is a scale factor [1], defined as a linear deviation relative to the real value.
During research work, it was found that the method of mounting the measuring unit affects the accuracy of location estimation of a moving person.
This method has a property of sin(x) / x impulse response low-pass filter.
Online since: July 2013
Authors: Nigamananda Das
It also finds application in solid coatings due to superior solvent properties.
Further improvement on catalytic performance could be possible by fine tuning of morphology and surface properties.
Further variation of Pd content in the range 0.1 to 1.0 wt% and H2 flow (10-30 ml/min), the overall acetone conversion was reduced without affecting the MIBK selectivity.
Vaccari, Hydrotalcite type anionic clay: Preparation, properties and applications, Catal.
Wu, Influence of synthesis method on the properties and catalytic performance of MCM-49 zeolites, Catal.
Further improvement on catalytic performance could be possible by fine tuning of morphology and surface properties.
Further variation of Pd content in the range 0.1 to 1.0 wt% and H2 flow (10-30 ml/min), the overall acetone conversion was reduced without affecting the MIBK selectivity.
Vaccari, Hydrotalcite type anionic clay: Preparation, properties and applications, Catal.
Wu, Influence of synthesis method on the properties and catalytic performance of MCM-49 zeolites, Catal.
Online since: October 2011
Authors: Jun Ling Niu, Lei Liu, Quan Guo Zhang
Effect of biogas production characteristics of dry anaerobic fermentation of wheat straw pretreated by a microbial community with high cellulose-degradation ability
Niu Junling1,a, Liu Lei1,b, Zhang Quanguo2,c
1 Zhengzhou Institute of Aeronautical Industry Management,Zhengzhou 450002,China
2 College of Mechanical and Electrical Engineering, Henan Agricultural University, Zhengzhou 450002, China
aniujl72@163.coml, bliulei@zzia.edu.cn, czquanguo@163.com
Keywords: wheat straw; pretreated; composite microbial system for degrading cellulose; dry anaerobic fermentation
Abstract: The study on the changes of composition and content reducing sugar of wheat straw after pretreated with composite microbial system for degrading cellulose was carried out, and the experimental study on the dry anaerobic fermentation of the pretreated wheat straw was followed.
To improve degradation property and dry fermentation gas production efficiency of straw, we should preprocess straw at first.
Inoculation amount 5% (bulk factor), and incubated at 50 °C under static conditions and with dissolved oxygen in the range of 0.02~0.4mg·L-1.
Comparative analysis of reducing sugar content Reducing sugar is the uppermost simple compounds which can be used in microbial fermentation process, fermentation in the early raw material of the reducing sugar, reducing sugar amount of raw material in early fermentation will directly affect the startup speed and fermentation efficiency of the whole fermentation reaction [10].
To improve degradation property and dry fermentation gas production efficiency of straw, we should preprocess straw at first.
Inoculation amount 5% (bulk factor), and incubated at 50 °C under static conditions and with dissolved oxygen in the range of 0.02~0.4mg·L-1.
Comparative analysis of reducing sugar content Reducing sugar is the uppermost simple compounds which can be used in microbial fermentation process, fermentation in the early raw material of the reducing sugar, reducing sugar amount of raw material in early fermentation will directly affect the startup speed and fermentation efficiency of the whole fermentation reaction [10].
Online since: January 2013
Authors: Bo Sun, Guang Yu Hong, Ming Tao Xu, Wen Jian Wang
Heat transfer performance of glazed units in dual airflow windows
Sun Bo1, a, Hong Guangyu1, b, Xu Mingtao1, c, Wang Wenjian2, d
1School of Mechanical and Power Engineering, Harbin University of Science and Technology, Xuefu Road 52, Harbin150080, China
2Heating Power Branch, Qiqihaer Heping Industry (group) Co., Ltd, Longhua Road 208, Qiqihaer 161000, China
asunbosting@sina.com, bhong.guangyu@tom.com, cljr1204@sohu.com, dwwjt23@163.com
Keywords: Dual airflow windows, Glazed units, Heat transfer, U value, Calculation model.
Consequently heat transfer performance of glazed units becomes a restrictive factor for dual airflow windows and need to be researched in depth.
For example, a 1.5m dual airflow window with 1.1m visible height, the range of equivalent height is from 1.1m to 1.5m.We chose the equivalent height because the gaps in glazed unit is far larger than the cavities in frame on the direction of height so that is difficult for air motion in the cavities to affect convection in the center of glazed unit.
This conclusion also applies to conventional windows for improving thermal insulation property.
Consequently heat transfer performance of glazed units becomes a restrictive factor for dual airflow windows and need to be researched in depth.
For example, a 1.5m dual airflow window with 1.1m visible height, the range of equivalent height is from 1.1m to 1.5m.We chose the equivalent height because the gaps in glazed unit is far larger than the cavities in frame on the direction of height so that is difficult for air motion in the cavities to affect convection in the center of glazed unit.
This conclusion also applies to conventional windows for improving thermal insulation property.