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Online since: May 2011
Authors: He Cen Wang, De Hou Jiang, Ying Liu
PPS filter material main characteristics and performance: PPS physicochemical properties indicate use continuously temperature 190˚C ,PPS liao physicochemical properties of continuous use temperature indicating 190˚C , instantaneous temperature 220 ˚C, this is made in the laboratory, aand the actual conditions of the data has certain disparity.PPS filter material oxidation resistance ability is weak, high temperatures will sulfur atoms combine with oxygen, easy to break the molecular structure (Fig. 1).
Electrostatic precipitators of two boilers in a plant were all changed to fixed pulse row-blowing bag dedusters.The distribution of flow gas entering into one bag deduster was poor and the boiler water-cooling wall tube burst happened many times, effect of oil atomization for ignition was not good, and these factors made the bag deduster’s operation far from perfect.
Ozone (O3) generate analysis for influence properties of PPS filter bag Composite electrostatic bag precipitator electric area part, produce corona discharge, make dust charged, will be charged dust flooding into dust collecting extremely dust collecting.
The analysis for NO2 of the flue gas influence on the PPS filter bag performance Except ozone (O3), another factor harming PPS is NO2 in flue gas.
If oxygen content is up to 12%, the temperature should drop to 140˚C.In brief, based on the experience at home and abroad[1-4],consider filter material physical properties, bending and permeability and long service life, the weight of filtering materials is 600g/m2.
Electrostatic precipitators of two boilers in a plant were all changed to fixed pulse row-blowing bag dedusters.The distribution of flow gas entering into one bag deduster was poor and the boiler water-cooling wall tube burst happened many times, effect of oil atomization for ignition was not good, and these factors made the bag deduster’s operation far from perfect.
Ozone (O3) generate analysis for influence properties of PPS filter bag Composite electrostatic bag precipitator electric area part, produce corona discharge, make dust charged, will be charged dust flooding into dust collecting extremely dust collecting.
The analysis for NO2 of the flue gas influence on the PPS filter bag performance Except ozone (O3), another factor harming PPS is NO2 in flue gas.
If oxygen content is up to 12%, the temperature should drop to 140˚C.In brief, based on the experience at home and abroad[1-4],consider filter material physical properties, bending and permeability and long service life, the weight of filtering materials is 600g/m2.
Online since: September 2005
Authors: Chun An Tang, Tian Hong Yang, Leslie George Tham, Wan Cheng Zhu, Lian Chong Li, S.Y. Wang
When rock is subjected to hydraulic loading,
these pre-existing defects can induce crack or fracture growth, which can in turn change the
structure of the rock and alter the fluid flow properties of the rock [13].
This heterogeneity related flow properties could influence the hydraulic fracturing behaviour in many ways.
• The local heterogeneity in the properties of rock masses is defined by Weibull function, that is − = − m o m oo s s s s s m ms exp ),( 1 ϕ (1) where s is the element strength f or elastic modulus E, and s0 is the mean strength f0 or elastic modulus of elements E0.
Table 1: Input material mechanical properties - mean values Parameter value Homogeneity index/ m 1.5,3,1000 Young's modulus/ E0 6 GPa Poisson's ratio / v 0.25 internal friction angle/φ 30° Compression strength/ fc 60MPa Tension strength/ ft 6MPa Coefficient of residual strength / f cr/ fc = f tr/ ft 0.1 Permeability/ k0 0.01m/s Initiate water pressure/ p i 5MPa water pressure /Δp 0.1MPa Water pressure coefficient/α 0.1 Biot's constants/β 0.01 From the computer pattern, one can conclude that the stress in each element is affected not only by the in-situ stresses but also its stiffness.
It can also be deduced previously that the pressurizing fluid flowing into the cracks is the main factor
This heterogeneity related flow properties could influence the hydraulic fracturing behaviour in many ways.
• The local heterogeneity in the properties of rock masses is defined by Weibull function, that is − = − m o m oo s s s s s m ms exp ),( 1 ϕ (1) where s is the element strength f or elastic modulus E, and s0 is the mean strength f0 or elastic modulus of elements E0.
Table 1: Input material mechanical properties - mean values Parameter value Homogeneity index/ m 1.5,3,1000 Young's modulus/ E0 6 GPa Poisson's ratio / v 0.25 internal friction angle/φ 30° Compression strength/ fc 60MPa Tension strength/ ft 6MPa Coefficient of residual strength / f cr/ fc = f tr/ ft 0.1 Permeability/ k0 0.01m/s Initiate water pressure/ p i 5MPa water pressure /Δp 0.1MPa Water pressure coefficient/α 0.1 Biot's constants/β 0.01 From the computer pattern, one can conclude that the stress in each element is affected not only by the in-situ stresses but also its stiffness.
It can also be deduced previously that the pressurizing fluid flowing into the cracks is the main factor
Online since: July 2003
Authors: Hoon Sohn, Gyuhae Park, Charles R. Farrar, Todd O. Williams, Amy N. Robertson, Francois M. Hemez
The physics-based models will also be used to define the necessary
sensing system properties (e.g. location, bandwidth, sensitivity).
Additionally, this work can be used to assist in the development of the experimental tests, define sensing system properties as well as aid in the development of the reduced order prognosis models suitable for deployment in microprocessors deployed onboard the structure.
Introducing the concept of super-elements into the MSFE formulation has resulted in a hierarchical analysis for the plate behavior that exhibits enhanced computational efficiency without adversely affecting the accuracy of the predictions for the local fields.
Homogenization is the process of combining matrix and fiber material properties into a single material that is representative of the individual lamina.
These techniques require parametric or nonparametric characterization of feature distributions or the estimation of statistical properties of the assumed distribution.
Additionally, this work can be used to assist in the development of the experimental tests, define sensing system properties as well as aid in the development of the reduced order prognosis models suitable for deployment in microprocessors deployed onboard the structure.
Introducing the concept of super-elements into the MSFE formulation has resulted in a hierarchical analysis for the plate behavior that exhibits enhanced computational efficiency without adversely affecting the accuracy of the predictions for the local fields.
Homogenization is the process of combining matrix and fiber material properties into a single material that is representative of the individual lamina.
These techniques require parametric or nonparametric characterization of feature distributions or the estimation of statistical properties of the assumed distribution.
Online since: September 2021
Authors: Elia Mercedes Alonso Guzmán, Wilfrido Martínez Molina, Hugo Luis Chavez Garcia, José María Ponce-Ortega, Cipriano Bernabé-Reyes, Arturo Zalapa-Damian
All this combined with one of the most important factors involved in the construction industry, the financial and environmental cost of maintenance and repair of structures.
Adewumi et al. [40] estimated the physical, mechanical and hydrological properties of permeable concrete using Support Vector Regression (SVR).
It was observed that having a large amount of laboratory data is important in order to diminish variations, since many of them significantly affect the final model.
Diez, Factors controlling cracking of concrete affected by reinforcement corrosion, Materials and Structures. 31 (1998) 435–441
Olatunji, Estimation of physical, mechanical and hydrological properties of permeable concrete using computational intelligence approach, Applied Soft Computing Journal. 42 (2016) 342–350
Adewumi et al. [40] estimated the physical, mechanical and hydrological properties of permeable concrete using Support Vector Regression (SVR).
It was observed that having a large amount of laboratory data is important in order to diminish variations, since many of them significantly affect the final model.
Diez, Factors controlling cracking of concrete affected by reinforcement corrosion, Materials and Structures. 31 (1998) 435–441
Olatunji, Estimation of physical, mechanical and hydrological properties of permeable concrete using computational intelligence approach, Applied Soft Computing Journal. 42 (2016) 342–350
Online since: December 2022
Authors: Jalal Faraj, Ehsan Jari, Farouk Hachem, Khaireldin Faraj, Rani Taher, Georges El Achkar, Mahmoud Khaled
Rao [37] reviewed details including different PCM-mortar combinations in addition to their thermal and mechanical properties in the field of synergy of PCM achieving energy efficiency in buildings.
It is known as a material made to be provided with thermal properties including thermal conductivity and resistance.
The curves fluctuate in accordance to outer temperature fluctuations which directly affects the total heat transfer value reaching a final value of 11.42 W for the insulated room and 88.211 W for the non-insulated room after 90 minutes.
Improvement factor versus time.
Comparative Analysis of the Thermal Insulation Properties of Fabrics Made of Natural and Man-Made Cellulose Fibers.
It is known as a material made to be provided with thermal properties including thermal conductivity and resistance.
The curves fluctuate in accordance to outer temperature fluctuations which directly affects the total heat transfer value reaching a final value of 11.42 W for the insulated room and 88.211 W for the non-insulated room after 90 minutes.
Improvement factor versus time.
Comparative Analysis of the Thermal Insulation Properties of Fabrics Made of Natural and Man-Made Cellulose Fibers.
Online since: July 2020
Authors: Zhen Zhong Zhang, Zi Wei Zhou, Wei Wei He, Jian Yong Hao, Jun Sun, Feng Zhang, Ze Dong Zheng
The preparation of ohmic contact with high stability and low resistance is critical, and the quality of ohmic contact will directly affect the performance of devices as the efficiency, gain and switching speed.
Introduction Silicon Carbide (SiC) is the one of the wide bandgap semiconductor materials with characterization of superior properties, such as high thermal conductivity, high breakdown field, high-saturation electron drift velocity, high chemical stability, and strong mechanical strength, which allow the development of high-power electronics applications [1, 2, 3, 4].
In this work, we use Ni as the contact metal, and try to clarify the ohmic contact properties of 4H-SiC power devices under different annealing processes.
First, as shown in the Fig. 1, the TLM pattern has been established to evaluate electrical properties of the Ni/n-SiC contacts as schematic view, the extra nickel silicide has been removed except contact pad position.
Kimoto, Temperature and doping dependencies of electrical properties in Al-doped 4H-SiC epitaxial layers, J.
Introduction Silicon Carbide (SiC) is the one of the wide bandgap semiconductor materials with characterization of superior properties, such as high thermal conductivity, high breakdown field, high-saturation electron drift velocity, high chemical stability, and strong mechanical strength, which allow the development of high-power electronics applications [1, 2, 3, 4].
In this work, we use Ni as the contact metal, and try to clarify the ohmic contact properties of 4H-SiC power devices under different annealing processes.
First, as shown in the Fig. 1, the TLM pattern has been established to evaluate electrical properties of the Ni/n-SiC contacts as schematic view, the extra nickel silicide has been removed except contact pad position.
Kimoto, Temperature and doping dependencies of electrical properties in Al-doped 4H-SiC epitaxial layers, J.
Online since: July 2011
Authors: Zhu Ge Yan, Simon Beecham, Chun Qi Lian
The hydraulic conductivity represents not only the properties of the porous medium but also the properties of the infiltrated fluid.
Intrinsic permeability on the other hand only describes the properties of the pores in the medium.
The previous works by the authors [2, 3, 4, 5] have studied the mechanical properties of enhanced porous concrete.
Also Crouch et al. [15] demonstrated that the constant head permeability would be a function of the pore properties.
References [1] Neville, A.M., Properties of concrete, England: Longman Group Ltd, (1995)
Intrinsic permeability on the other hand only describes the properties of the pores in the medium.
The previous works by the authors [2, 3, 4, 5] have studied the mechanical properties of enhanced porous concrete.
Also Crouch et al. [15] demonstrated that the constant head permeability would be a function of the pore properties.
References [1] Neville, A.M., Properties of concrete, England: Longman Group Ltd, (1995)
Online since: October 2007
Authors: Osamu Yoshinari, Daisuke Itoh
During a heating measurement of
Pd47Ti50Cr3 alloy, both D and q abruptly increased by factors of 5 and 2, respectively, at 712 K,
with a phase transformation from B19 to B2 structures.
Introduction Since hydrogen permeability of metal is the product of the diffusivity and the solubility of hydrogen, materials with appropriate magnitudes in both properties can be candidates for the hydrogen permeable films.
After mechanical surface polishing, they were again annealed at 1253 K for 24 h in vacuum and then furnace-cooled.
Since the transformation temperatures have known to be strongly dependent on Cr concentration, some subtle difference in the composition may affect them.
Introduction Since hydrogen permeability of metal is the product of the diffusivity and the solubility of hydrogen, materials with appropriate magnitudes in both properties can be candidates for the hydrogen permeable films.
After mechanical surface polishing, they were again annealed at 1253 K for 24 h in vacuum and then furnace-cooled.
Since the transformation temperatures have known to be strongly dependent on Cr concentration, some subtle difference in the composition may affect them.
Online since: March 2009
Authors: Elena Verbitskaya, Vladimir Eremin, Panja Luukka, Jaakko Härkönen, Esa Tuovinen, Sandor Czellar, Zheng Li, Eija Tuominen
The overall CCE is a product of trapping and geometrical factor related with the full depletion.
Due to the mechanical design of the copper based cold finger, the diodes can be illuminated only on the front side.
These complexes are called thermal donors (TD) and they influence the electrical properties of the detectors.
In radiation hardness studies the results are often scaled to 1 MeV neutron equivalent values with the help of the hardness factors.
One could assume hardness factors of 5 and 0.6 for 9 MeV and 24 GeV/c protons, respectively.
Due to the mechanical design of the copper based cold finger, the diodes can be illuminated only on the front side.
These complexes are called thermal donors (TD) and they influence the electrical properties of the detectors.
In radiation hardness studies the results are often scaled to 1 MeV neutron equivalent values with the help of the hardness factors.
One could assume hardness factors of 5 and 0.6 for 9 MeV and 24 GeV/c protons, respectively.
Online since: July 2015
Authors: Puttiporn Puttawibul, Soottawat Benjakul, Jirut Meesane
The important role of collagen is to maintain mechanical properties of tissue and to act as an insoluble signal for cell communication.
According to previous results, methylcellulose affected collagen fibril organization.
Yang, L.J.Kaufman, Rheology and confocal reflectance microscopy as probes of mechanical properties and structure during collagen and collagen/hyaluronan self-assembly.
Yu, Properties of biodegradable thermoplastic pea starch/carboxymethyl cellulose and pea starch/microcrystalline cellulose composites.
Pietrucha, Effect of fish collagen modification on its thermal and rheological properties.
According to previous results, methylcellulose affected collagen fibril organization.
Yang, L.J.Kaufman, Rheology and confocal reflectance microscopy as probes of mechanical properties and structure during collagen and collagen/hyaluronan self-assembly.
Yu, Properties of biodegradable thermoplastic pea starch/carboxymethyl cellulose and pea starch/microcrystalline cellulose composites.
Pietrucha, Effect of fish collagen modification on its thermal and rheological properties.