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Online since: December 2014
Authors: Feng Zhong Sun, Jia You Liu
Moreover, PM2.5 can long exist in the atmosphere, reducing visibility, resulting in frequent haze phenomenon, affecting traffic, affecting crop growth.
For garbage incinerators, large amounts of contaminants (such as dust, acid gases, heavy metals, dioxins, etc.) in the flue gas generated in municipal solid waste incineration process are important precursors of PM2.5, the emission factor of PM2.5 is 5.2~29.0g/kg when flame burning, and the emission factor is 2.4~11.5 times of that when stuffy burning [7].
For biomass boilers, pollutants from biomass burning are important sources of PM2.5, for example, for crop stalks, the emission factor of PM2.5 is 7.2~39.0g/kg when flame burning, and the emission factor of PM2.5 is 67.6-104.6g/kg when stuffy burning [8].
At present, the mechanical precipitators such as inertial dustseparator and cyclones, etc. are still used as a pre-dedusting equipment on industrial boilers with capacity of 10t/h or below 10t/h.
(2) Adjustment the fuel particle properties reasonably, choose high efficient dust removal equipment properly.
For garbage incinerators, large amounts of contaminants (such as dust, acid gases, heavy metals, dioxins, etc.) in the flue gas generated in municipal solid waste incineration process are important precursors of PM2.5, the emission factor of PM2.5 is 5.2~29.0g/kg when flame burning, and the emission factor is 2.4~11.5 times of that when stuffy burning [7].
For biomass boilers, pollutants from biomass burning are important sources of PM2.5, for example, for crop stalks, the emission factor of PM2.5 is 7.2~39.0g/kg when flame burning, and the emission factor of PM2.5 is 67.6-104.6g/kg when stuffy burning [8].
At present, the mechanical precipitators such as inertial dustseparator and cyclones, etc. are still used as a pre-dedusting equipment on industrial boilers with capacity of 10t/h or below 10t/h.
(2) Adjustment the fuel particle properties reasonably, choose high efficient dust removal equipment properly.
Online since: April 2008
Authors: Jian Zhong Zhou, Yue Qing Sun, Yi Bin Chen, Shu Huang, Su Qing Jiang
Introduction
With the advent of high-power pulsed lasers, an emerging process named Laser Shock Peening
(LSP) is developing, which uses laser shock wave to create residual compressive stress on the
superficial layer, and then metal plate creates appreciable improvements in surface properties [1].
As we all known, residual stress is the main influencing factor to the deformation and crack of parts, and will affect the components' static strength, resistance to fatigue and corrosion.
Fig.5 Residual stress after forming Fig.6 Surface topography after forming (100×) Response Optimizer Design of Strengthening Effects Factorial Design can be used to study the effects of multi-factors during LSP simultaneously, which will save more cost and time than studying single factor, what's more, the interaction between factors can be approached.
These plots show how a response variable relates to two factors based on a model equation.
Ni: The Study of The Mechanism and It's influencing Factors on Laser Peen Forming of Sheet Metal (Jiangsu University,China,2006) [7] J.J.
As we all known, residual stress is the main influencing factor to the deformation and crack of parts, and will affect the components' static strength, resistance to fatigue and corrosion.
Fig.5 Residual stress after forming Fig.6 Surface topography after forming (100×) Response Optimizer Design of Strengthening Effects Factorial Design can be used to study the effects of multi-factors during LSP simultaneously, which will save more cost and time than studying single factor, what's more, the interaction between factors can be approached.
These plots show how a response variable relates to two factors based on a model equation.
Ni: The Study of The Mechanism and It's influencing Factors on Laser Peen Forming of Sheet Metal (Jiangsu University,China,2006) [7] J.J.
Online since: July 2022
Authors: Patricia Verleysen, Luca Corallo, Claudio Lonardi
The current work aims to investigate the influence of the aforementioned factors on the predicted FLD of Ti-6Al-4V.
The nature of the imperfection can lie in different factors, such as surface roughness or a macroscopic defect.
For the FLDs of Fig. 5a, the quasi-static hardening properties along the rolling direction are used for the fitting of the hardening laws.
Hence, the FLD is negatively affected.
Galan-Lopez, Experimental and numerical prediction of the static and dynamic forming properties of Ti6Al4V, International conference on High Speed Forming 2016 (2016)
The nature of the imperfection can lie in different factors, such as surface roughness or a macroscopic defect.
For the FLDs of Fig. 5a, the quasi-static hardening properties along the rolling direction are used for the fitting of the hardening laws.
Hence, the FLD is negatively affected.
Galan-Lopez, Experimental and numerical prediction of the static and dynamic forming properties of Ti6Al4V, International conference on High Speed Forming 2016 (2016)
Online since: February 2006
Authors: Klaus Weinert, Jens Rautenberg, Niels Hammer
To obtain detailed process knowledge also FEA-Simulations of the thermo-mechanical
loads affecting the workpiece during the process are performed.
Machining thin-walled, reinforced, and non-reinforced extruded light metal profiles and their resulting framework structures is often regarded as critical because of manifold factors influencing the machining process.
For the experimental investigations presented below, the composite extrusion profiles consist of common aluminium wrought alloy (AlMgSi0.5) as matrix material and high strength steel alloy (X12CrNi17-7) with good mechanical properties at elevated temperatures as reinforcement material.
Especially due to specific properties like increased strength and restricted crack growth these materials are predestined for security relevant components that need an overload protection.
The high strength properties of the steel fibres lead to significant tool wear when drilling these fibres.
Machining thin-walled, reinforced, and non-reinforced extruded light metal profiles and their resulting framework structures is often regarded as critical because of manifold factors influencing the machining process.
For the experimental investigations presented below, the composite extrusion profiles consist of common aluminium wrought alloy (AlMgSi0.5) as matrix material and high strength steel alloy (X12CrNi17-7) with good mechanical properties at elevated temperatures as reinforcement material.
Especially due to specific properties like increased strength and restricted crack growth these materials are predestined for security relevant components that need an overload protection.
The high strength properties of the steel fibres lead to significant tool wear when drilling these fibres.
Online since: June 2019
Authors: Abdelhak Bordjiba, Hassib Rhailia
In this experimental plan three factors have been proposed, the answer find is the behavior of the recycled asphalt to fatigue and the influence of factors study on the response for each formula also the compatibility of binders with the performance wish.
These results have confirmed the classic tests performed where we have seen that the rate of aggregate of asphalt contains a percentage of the old binder which affects the mechanical performance of recycled asphalt.
The modeling allows you to determine equation (1) by which one can estimate the fatigue for different rates of the factors studied. 6.
Zhanping, the properties of asphalt binder blended with variable quantities of recycled asphalt using short term and long term aging simulations, Cons.
Eggett, Effects of Reclaimed Asphalt Pavement on Mechanical Properties of Base Materials, Journal of the Transportation Research Board. (2005) 44-52
These results have confirmed the classic tests performed where we have seen that the rate of aggregate of asphalt contains a percentage of the old binder which affects the mechanical performance of recycled asphalt.
The modeling allows you to determine equation (1) by which one can estimate the fatigue for different rates of the factors studied. 6.
Zhanping, the properties of asphalt binder blended with variable quantities of recycled asphalt using short term and long term aging simulations, Cons.
Eggett, Effects of Reclaimed Asphalt Pavement on Mechanical Properties of Base Materials, Journal of the Transportation Research Board. (2005) 44-52
Online since: July 2007
Authors: Mario Piacentini, Gianluca Buffa, Livan Fratini
TIG or laser, determine quite weak joints due to a
strong increase of the average grain size observed in the melted material and to quite large thermally
affected zones.
Then a simple heat affected zone (HAZ, C) is reached, in which material has undergone a thermal cycle which has modified the microstructure and the mechanical properties.
In this way, this zone is a thermomechanically affected one (TMAZ, B).
It should be observed that the peculiarities of the obtained microstructures strongly determine the joint effectiveness and its mechanical behavior.
It should be observed that maintaining good mechanical properties with high processing speed is always a desirable effect for a process that is likely to be used in industrial applications where the production time is a key factor; in fact the additional time required for the tool path completion is small if compared to the total processing time (basically due to clamping and sinking), and it's counterbalanced both by the elimination of the dwelling time, in which the tool stays in the sheets before being retracted, and by the relatively high advancing velocity reachable.
Then a simple heat affected zone (HAZ, C) is reached, in which material has undergone a thermal cycle which has modified the microstructure and the mechanical properties.
In this way, this zone is a thermomechanically affected one (TMAZ, B).
It should be observed that the peculiarities of the obtained microstructures strongly determine the joint effectiveness and its mechanical behavior.
It should be observed that maintaining good mechanical properties with high processing speed is always a desirable effect for a process that is likely to be used in industrial applications where the production time is a key factor; in fact the additional time required for the tool path completion is small if compared to the total processing time (basically due to clamping and sinking), and it's counterbalanced both by the elimination of the dwelling time, in which the tool stays in the sheets before being retracted, and by the relatively high advancing velocity reachable.
Online since: August 2009
Authors: Yuan Biao Wu, Wei Ping Chen, Wei Xia, Zhen Xing Zheng
These kinds of
alloy have many common properties such as high density, small thermo-expansion coefficient,
anti-cautery, anti-oxidation and the fine conductivity of electric and heat.
In the numerical simulation, the process parameters which can affect the quality of the product in the filling and packing process are selected as experimental factors.
In table 1, the experimental factors and factor level are listed in detail.
The factors and levels are shown as table 3.
The array of factors is shown in table 4 in which factors A,B,C, D and E are corresponding with the ones of the numerical simulation.
In the numerical simulation, the process parameters which can affect the quality of the product in the filling and packing process are selected as experimental factors.
In table 1, the experimental factors and factor level are listed in detail.
The factors and levels are shown as table 3.
The array of factors is shown in table 4 in which factors A,B,C, D and E are corresponding with the ones of the numerical simulation.
Online since: January 2010
Authors: De Gong Chang, J. Zhang, M.L. Lv
Strength and Influencing Factors
Anti-shear strength of different joint clearance.
It can change the microscopic constitution of brazed joints fundamentally; therefore it also can change their mechanical property.
The precipitate within the brazing filler metal has effect on the dislocation movement and grain growth as well as the mechanical property of brazed joints.
For the microstructure of brazed joints affects its mechanical properties, the intermetallic compounds should be restrained.
Conclusion (1) While the solder paste 08 steel was brazed by pure copper, the solid solution interface area organizations have good strength and plasticity which can utilize fully the mechanical properties of 08 steel.
It can change the microscopic constitution of brazed joints fundamentally; therefore it also can change their mechanical property.
The precipitate within the brazing filler metal has effect on the dislocation movement and grain growth as well as the mechanical property of brazed joints.
For the microstructure of brazed joints affects its mechanical properties, the intermetallic compounds should be restrained.
Conclusion (1) While the solder paste 08 steel was brazed by pure copper, the solid solution interface area organizations have good strength and plasticity which can utilize fully the mechanical properties of 08 steel.
Online since: June 2019
Authors: Zu Ming Hu, Guang Yu Duan
Owing to the special structure of meta-type benzene-amide linkage, PMIA exhibits outstanding thermal stability (Tg = 278 °C), excellent flame retardancy, high operating temperature and good mechanical property.
SEM images of impact fractures of (a) fBN-0, (b) fBN-30 Dielectric property of PMIA/fBN composite For electronic insulation materials, dielectric properties are vital to meet specific requirements.
The dielectric properties of PMIA/fBN composites were tested in the frequency range of 102-106 Hz, as manifested in Fig. 2(a&b).
This can be mainly attributed to two factors: (ⅰ) with increasing content of fBN, fBN particles can connect with each other to form heat transfer pathways, which can improve thermal conductivities of PMIA/fBN composites. (ⅱ) it is well known that the interface thermal resistance is a key factor affecting the thermal conductivity in organic-inorganic hybrid composites, and reducing it can improve the thermal conductivity significantly [12].
Improved thermal conductivity and dielectric properties of hBN/PTFE composites via surface treatment by silane coupling agent[J].
SEM images of impact fractures of (a) fBN-0, (b) fBN-30 Dielectric property of PMIA/fBN composite For electronic insulation materials, dielectric properties are vital to meet specific requirements.
The dielectric properties of PMIA/fBN composites were tested in the frequency range of 102-106 Hz, as manifested in Fig. 2(a&b).
This can be mainly attributed to two factors: (ⅰ) with increasing content of fBN, fBN particles can connect with each other to form heat transfer pathways, which can improve thermal conductivities of PMIA/fBN composites. (ⅱ) it is well known that the interface thermal resistance is a key factor affecting the thermal conductivity in organic-inorganic hybrid composites, and reducing it can improve the thermal conductivity significantly [12].
Improved thermal conductivity and dielectric properties of hBN/PTFE composites via surface treatment by silane coupling agent[J].
Online since: January 2022
Authors: Leonid I. Dvorkin, P. Thiele, J. Khatib, A. Abdalqader, Nataliya Lushnikova, Mohammed Sonebi
A recent study compared the thermal and mechanical properties of different materials based on clay and vegetal aggregates including rape straw and clay (Brouard et al., 2018).
Experimental study of parameters influencing mechanical properties of hemp concretes.
Mechanical and thermal properties of lime and hemp concrete (“hempcrete”) manufactured by a projection process.
Effect of Viscosity Modifying Agent on the Mechanical and Transport Properties of Hemp and Rapeseed Straw Concrete. 2nd Int.
Experimental study on mechanical properties of low-volume rape straw fiber concrete.
Experimental study of parameters influencing mechanical properties of hemp concretes.
Mechanical and thermal properties of lime and hemp concrete (“hempcrete”) manufactured by a projection process.
Effect of Viscosity Modifying Agent on the Mechanical and Transport Properties of Hemp and Rapeseed Straw Concrete. 2nd Int.
Experimental study on mechanical properties of low-volume rape straw fiber concrete.