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Online since: September 2013
Authors: Jiu Sheng Shi, Fei Peng, Bing Wen Zhang
In various heat loss, heat loss Q5 and ash physical heat loss Q6 amount is small, are related to the boiler equipment material quality,heat preservation,boiler load and fuel property,etc, respectively.has little to do with running adjustment [2].
So the temperature of furnace temperature is mainly affected by smoke loss Q2 and incomplete combustion loss Q3+Q4.
And smoke heat loss is the larger one, generally about 6% ~ 12%, exhaust temperature and exhaust smoke volume are the main influencing factors, the more excess air, the more exhaust smoke volume is, the greater the smoke losses is. solid incomplete combustion loss is mainly due to that the ash carbon content is higher. the coal inside the furnace stay a short time, Cause a red slag row away.
Excess air coefficient is large, the fuel in the oxygen-rich combustion, fuel can fully burn, mechanical incomplete combustion heat loss is decreased but increases the portion of the exhaust losses.
Excess air coefficient are the important factors to influence the boiler furnace temperature and boiler efficiency, air quantity so big, can make excess air absorb large amounts of heat from the chimney.
So the temperature of furnace temperature is mainly affected by smoke loss Q2 and incomplete combustion loss Q3+Q4.
And smoke heat loss is the larger one, generally about 6% ~ 12%, exhaust temperature and exhaust smoke volume are the main influencing factors, the more excess air, the more exhaust smoke volume is, the greater the smoke losses is. solid incomplete combustion loss is mainly due to that the ash carbon content is higher. the coal inside the furnace stay a short time, Cause a red slag row away.
Excess air coefficient is large, the fuel in the oxygen-rich combustion, fuel can fully burn, mechanical incomplete combustion heat loss is decreased but increases the portion of the exhaust losses.
Excess air coefficient are the important factors to influence the boiler furnace temperature and boiler efficiency, air quantity so big, can make excess air absorb large amounts of heat from the chimney.
Online since: August 2017
Authors: Adrian Manescu, Alessandra Giuliani, Fabrizio Fiori, Franco Rustichelli, Emmanuelle Girardin, Serena Mazzoni, Evzen Amler
The mechanical behaviour of materials is also affected by microstructural features.
This composite system has gained great interest in recent years due to its paramagnetic properties, excellent resistance to wear and corrosion, and high hardness.
Finally, imaging techniques such as neutron tomography and X-ray microtomography were presented, with an example of their application for the determination of some structural features of cellular in materials for aerospace technology, and their correlation to mechanical properties.
Spinozzi, Innovative Technological Materials (Structural Properties by Neutron Scattering, Synchrotron Radiation and Modeling), Editors: J.J.
Ashby, Cellular Solids: Structure and Properties, Cambridge University Press (1999), ISBN 0521499119.
This composite system has gained great interest in recent years due to its paramagnetic properties, excellent resistance to wear and corrosion, and high hardness.
Finally, imaging techniques such as neutron tomography and X-ray microtomography were presented, with an example of their application for the determination of some structural features of cellular in materials for aerospace technology, and their correlation to mechanical properties.
Spinozzi, Innovative Technological Materials (Structural Properties by Neutron Scattering, Synchrotron Radiation and Modeling), Editors: J.J.
Ashby, Cellular Solids: Structure and Properties, Cambridge University Press (1999), ISBN 0521499119.
Online since: February 2019
Authors: I.V. Zhernovskaya, Alla V. Cherevatova, M.I. Kozhukhova, D.A. Alehin
It is known that the mechanism as well as the terms of structure formation dramatically affect the composition of the final binder system.
Traditional binding systems such as Portland cement, gypsum, lime cement are thoroughly studied in terms of phase- and structure formation taking into account various contributing factors [1–6].
The appearance of new thermal resistance properties of CNGSB system associated with the formation of well-structured dense matrix due to a combined action of two structure formation mechanisms: polymerization-polycondensation and hydration.
The mechanical and physical performance of the binder cured in ambient conditions shown in Table 1.
Evtushenko Study of Artificial Ceramic Binder Properties in the System Al2O3–SiO2–SiC, Refractories and Industrial Ceramics. 57(5) (2017) 526–530
Traditional binding systems such as Portland cement, gypsum, lime cement are thoroughly studied in terms of phase- and structure formation taking into account various contributing factors [1–6].
The appearance of new thermal resistance properties of CNGSB system associated with the formation of well-structured dense matrix due to a combined action of two structure formation mechanisms: polymerization-polycondensation and hydration.
The mechanical and physical performance of the binder cured in ambient conditions shown in Table 1.
Evtushenko Study of Artificial Ceramic Binder Properties in the System Al2O3–SiO2–SiC, Refractories and Industrial Ceramics. 57(5) (2017) 526–530
Online since: May 2015
Authors: Zhen Dong Dai, Yang Li, Ru Li, Hao Zhang, Min Luo, Yong Yi Zhang
Introduction
Since carbon nanotubes (CNTs) were first reported in 1991 [1], they have attracted significant attention in the field of nanotechnology owing to their excellent electrical, thermal, and mechanical properties and are considered as a next-generation nanomaterial [2].
Together, these two factors could determine the height distribution of the synthesized CNT arrays.
Therefore, more factors during the CVD growth should be examined and analyzed, and the model need to be further developed in our future work.
Dai, Self-oriented regular arrays of carbon nanotubes and their field emission properties, Science 283(1999) 512-514
Dai, Self-oriented regular arrays of carbon nanotubes and their field emission properties, Science 283 (1999) 512-514
Together, these two factors could determine the height distribution of the synthesized CNT arrays.
Therefore, more factors during the CVD growth should be examined and analyzed, and the model need to be further developed in our future work.
Dai, Self-oriented regular arrays of carbon nanotubes and their field emission properties, Science 283(1999) 512-514
Dai, Self-oriented regular arrays of carbon nanotubes and their field emission properties, Science 283 (1999) 512-514
Online since: July 2008
Authors: T. Asai, Ryoji Nakamura, Hisaki Watari, Shinji Kumai
The
mechanical properties of the bar cast by these was continuous casting process was very fine.
In the present study, properties of the rheo-casting by UEDTRC to cast bar was investigated.
Flow rate of the melt affected the cooling of the melt.
The fall height of the melt affected the heat transfer between the melt and the cooling slope.
The falling height of the melt was important factor to cool the melt.
In the present study, properties of the rheo-casting by UEDTRC to cast bar was investigated.
Flow rate of the melt affected the cooling of the melt.
The fall height of the melt affected the heat transfer between the melt and the cooling slope.
The falling height of the melt was important factor to cool the melt.
Online since: February 2024
Authors: Chen Yuan Chung, Yu Min Huang, Siang Sian Lin
With regard to mechanical properties, it has high tensile strength and high abrasion resistance.
Material The material used in this study is the Elastollan® 1185A TPU from BASF Corporation, which has the properties of elastomer at room temperature and plasticizing properties of plastic at high temperature.
Experimental process parameters Factors Value MWCNT (wt% ) 0.3 SCF (wt%) 0.6 GCP pressure (bar) GCP holding time (s) 15 8 Table 2.
The consequence further affects the process stability and mechanical properties of the material.
Luo, Cell morphology and mechanical properties of microcellular mucell® injection molded polyetherimide and polyetherimide/fillers composite foams, Journal of Applied Polymer Science 130 (2013) 4171-4181
Material The material used in this study is the Elastollan® 1185A TPU from BASF Corporation, which has the properties of elastomer at room temperature and plasticizing properties of plastic at high temperature.
Experimental process parameters Factors Value MWCNT (wt% ) 0.3 SCF (wt%) 0.6 GCP pressure (bar) GCP holding time (s) 15 8 Table 2.
The consequence further affects the process stability and mechanical properties of the material.
Luo, Cell morphology and mechanical properties of microcellular mucell® injection molded polyetherimide and polyetherimide/fillers composite foams, Journal of Applied Polymer Science 130 (2013) 4171-4181
Online since: February 2019
Authors: N.S. Yousef, Z.F. Ghatass, Mohamed S. Badawi, M.M. Mohamed, Mostafa Elkhatib, Ahmed M. El-Khatib
Furthermore, separation factors and distribution coefficients of Methylene blue (MB) dye were calculated.
The particle morphology and initial concentration of MB dye are important factors affecting the adsorption process [23].
According to this review the major concern in this study of arc discharge synthesis is to improve the yield quality and quantity which affected by several physical factors or chemical factors.
The most important chemical factors are pH, reducing agent and surface capping stabilizer.
[21] Orvatinia, M., Temperature effect on structural and electronic properties of zinc oxide nanowires synthesized by carbothermal evaporation method, Int.
The particle morphology and initial concentration of MB dye are important factors affecting the adsorption process [23].
According to this review the major concern in this study of arc discharge synthesis is to improve the yield quality and quantity which affected by several physical factors or chemical factors.
The most important chemical factors are pH, reducing agent and surface capping stabilizer.
[21] Orvatinia, M., Temperature effect on structural and electronic properties of zinc oxide nanowires synthesized by carbothermal evaporation method, Int.
Online since: July 2011
Authors: Xiao Xiong Zha, Kai Zhang
Mechanical method is used when making foaming agent into foams.
The additive of Mukah affect greatly on the stability of the foam, and the crash of the foam cause collapse, Showing lower performance than Styrene— butadiene latex.
The mechanical behaviors and failure mode have been discussed.
Composition is the primary factor to influence foam concrete strength, mainly including the type of gelling materials, the foaming agent and activate micro-aggregates. 3.
[2] Wenjuan Song, Qu Shenghua, Using waste material prepare cement mortar mechanical properties of impedance spectroscopy[J]: Fly Ash Vol. 5(2007), p. 14-18,in Chinese
The additive of Mukah affect greatly on the stability of the foam, and the crash of the foam cause collapse, Showing lower performance than Styrene— butadiene latex.
The mechanical behaviors and failure mode have been discussed.
Composition is the primary factor to influence foam concrete strength, mainly including the type of gelling materials, the foaming agent and activate micro-aggregates. 3.
[2] Wenjuan Song, Qu Shenghua, Using waste material prepare cement mortar mechanical properties of impedance spectroscopy[J]: Fly Ash Vol. 5(2007), p. 14-18,in Chinese
Online since: December 2012
Authors: Zhao Ning Gao
Based on this, the mechanical model is established and the property of stress distribution of the coal floor is analyzed, which explains the impact of water inrush.
Analysis of mining stress on coal floor After coal mining, in-situ rock mass stress field round the stope is affected by mining.
According to the characteristics of abutment pressure, the calculation simplified mechanical model is established, as shown in Fig.1.
And the stress reaches to maximum at a distance of 10m in front of the face, where the stress concentration factor is 2.48 and coal floor is in a state of compression.
Conclusions (1) The mechanical model of the coal floor is established, and the analytical solution of distribution of floor stress is obtained.
Analysis of mining stress on coal floor After coal mining, in-situ rock mass stress field round the stope is affected by mining.
According to the characteristics of abutment pressure, the calculation simplified mechanical model is established, as shown in Fig.1.
And the stress reaches to maximum at a distance of 10m in front of the face, where the stress concentration factor is 2.48 and coal floor is in a state of compression.
Conclusions (1) The mechanical model of the coal floor is established, and the analytical solution of distribution of floor stress is obtained.
Online since: July 2015
Authors: Bogdan Szturomski
The political situation affected significantly to build new warships and marine facilities and the modernization of existing by the need to protect the crew in front of the fire with a machine gun or the effects of shock loads from underwater explosions.
Currently in CAE [3, 4, 5, 6, 7], mainly for the steel and aluminum alloys adopted certain standards description of material properties.
In conclusion, the coefficients for the analyzed steel for Johnson-Cook’s constitutive model take the values: A = 700 MPa q0 = 293,15 K B = 640 MPa qtop = 1733÷1793 K C = 0,024 n = 0,6 m – 0.75÷1,0 Other properties of this steel is assumed for the calculation: · density - r = 7850 kg/m3; · Young’s moduls - E = 2,09×105 MPa; · Poisson’s ratio - n = 0,3; · yield strength - Re = 700 MPa; · ultimate strength - Rm = 853 MPa.
The experimental results enabled the verifications performed computer simulations, in which besides the characteristics of the material, the effect on the results obtained has a number of other factors such as failure criterion of the material and its parameters, the implementation of contact, discretization and description of the elements, the choice of the time step integration of equations of motion and a lot of factors.
In the tasks from the scope of the material model design into impulse resistance is just one of the many important elements affecting the results obtained.
Currently in CAE [3, 4, 5, 6, 7], mainly for the steel and aluminum alloys adopted certain standards description of material properties.
In conclusion, the coefficients for the analyzed steel for Johnson-Cook’s constitutive model take the values: A = 700 MPa q0 = 293,15 K B = 640 MPa qtop = 1733÷1793 K C = 0,024 n = 0,6 m – 0.75÷1,0 Other properties of this steel is assumed for the calculation: · density - r = 7850 kg/m3; · Young’s moduls - E = 2,09×105 MPa; · Poisson’s ratio - n = 0,3; · yield strength - Re = 700 MPa; · ultimate strength - Rm = 853 MPa.
The experimental results enabled the verifications performed computer simulations, in which besides the characteristics of the material, the effect on the results obtained has a number of other factors such as failure criterion of the material and its parameters, the implementation of contact, discretization and description of the elements, the choice of the time step integration of equations of motion and a lot of factors.
In the tasks from the scope of the material model design into impulse resistance is just one of the many important elements affecting the results obtained.