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Online since: October 2011
Authors: Feng Shan Ma, Ai Hua Wei, De Min Ding, Jie Guo
Introduction
Land subsidence induced by groundwater over-draft has been a common human-induced hazard affecting many cities in China [1].
And the rebound value is minus to the land subsidence induced by the drawdown of groundwater in most instances, which is related to many factors, including groundwater exploitation history, piezometric level evolution, and local hydrogeological properties.
The related mechanical parameters mostly based on laboratory experiments, filed tests, and the report of Tianjin Survey Institute of Geologic and Minerals.
And the rebound value is minus to the land subsidence induced by the drawdown of groundwater in most instances, which is related to many factors, including groundwater exploitation history, piezometric level evolution, and local hydrogeological properties.
The related mechanical parameters mostly based on laboratory experiments, filed tests, and the report of Tianjin Survey Institute of Geologic and Minerals.
Online since: June 2014
Authors: M. Senthil Kumar, K. Mahadevan
Initially, stock prepared [3] from different raw materials such as chemical pulp from pulp mills, mechanical pulp from chip refiners, chemicals and additives are mixed together.
Raw material properties, the condition of the paper machine, basis weight, moisture and speed, all affect the drying rate.
The factors most of the influence paper drying operation are (i) steam pressure and temperature, (ii) temperature and humidity of air, (iii) energy content of steam and (iv) heat and mass transfer coefficients.
-0.67 -0.33 0 0.33 0.67 1 -2 -1.33 -0.67 0 0.67 1.33 2 -1 -0.67 -0.33 0 0.33 0.67 1 Error(input) Change in error (Input) Control output Fuzzy Rules de NB NM NS Z PS PM PB NB-NEGATIVE BIG NB NB NB NB NB NM NS Z NM-NEGATIVE MEDIUM NM NB NB NB NM NS Z PS NS-NEGATIVE SMALL NS NB NB NM NS Z PS PM Z-ZERO Z NB NM NS Z PS PM PB PS-POSITIVE SMALL PS NM NS Z PS PM PB PB PM-POSITIVE MEDIUM PM NS Z PS PM PB PB PB PB-POSITIVE BIG PB Z PS PM PB PB PB PB Identification Of Process Parameters In general, plant parameters are changed due to age of the plant or changes in the load and also, the process non-linearities and time dependent characteristics cause a significant change in the dynamic parameters of the process, which necessitates identification of the process model is it different operating conditions. so that controller design can be affected
Raw material properties, the condition of the paper machine, basis weight, moisture and speed, all affect the drying rate.
The factors most of the influence paper drying operation are (i) steam pressure and temperature, (ii) temperature and humidity of air, (iii) energy content of steam and (iv) heat and mass transfer coefficients.
-0.67 -0.33 0 0.33 0.67 1 -2 -1.33 -0.67 0 0.67 1.33 2 -1 -0.67 -0.33 0 0.33 0.67 1 Error(input) Change in error (Input) Control output Fuzzy Rules de NB NM NS Z PS PM PB NB-NEGATIVE BIG NB NB NB NB NB NM NS Z NM-NEGATIVE MEDIUM NM NB NB NB NM NS Z PS NS-NEGATIVE SMALL NS NB NB NM NS Z PS PM Z-ZERO Z NB NM NS Z PS PM PB PS-POSITIVE SMALL PS NM NS Z PS PM PB PB PM-POSITIVE MEDIUM PM NS Z PS PM PB PB PB PB-POSITIVE BIG PB Z PS PM PB PB PB PB Identification Of Process Parameters In general, plant parameters are changed due to age of the plant or changes in the load and also, the process non-linearities and time dependent characteristics cause a significant change in the dynamic parameters of the process, which necessitates identification of the process model is it different operating conditions. so that controller design can be affected
Online since: May 2004
Authors: Aldo Roberto Boccaccini
Both aqueous and non-aqueous suspensions have been used and the different factors affecting
the EPD behavior of ceramic sols and their optimization to obtain high infiltration of the fibre
preforms are now quite well-understood [10].
The mechanical properties of the 3-D TiO2/carbon fibre composites have not been measured.
The mechanical properties of the 3-D TiO2/carbon fibre composites have not been measured.
Online since: December 2011
Authors: Si Yu Yuan, Zhong Qiang Wang, Pei Long Wang, Ming Xin Gao, Hao Jia, Juan Juan Jiang, Hua Song
Introduction
When rolled heavy rail is on the cooling bed for natural cooling, its bending deformation caused by solid phase changing and the section size contraction deformation occurs, there are many factors affecting cooling after deformation of heavy rail, such as the initial cooling temperature, environment temperature and cooling rate [1].
Flashline TM-5000 Thermal Properties Analyze produced by United States Anter Company is applied to measuring U75V heavy rail specific heat c and the coefficient of thermal conductivity λ, and it is shown in Figures 3 and 4, respectively.
Initial cooling temperature effecting on bending and section sizes of cold heavy rail Thermo-mechanical coupling module of software Ansys is applied to numerical simulation on 60kg/m U75V heavy rail in the initial temperature respectively of 950℃, 900℃, 870℃ and 850℃ during the cooling process, and it is found that the bending and the section size change of cooling after heavy rail in different initial cooling temperature.
Flashline TM-5000 Thermal Properties Analyze produced by United States Anter Company is applied to measuring U75V heavy rail specific heat c and the coefficient of thermal conductivity λ, and it is shown in Figures 3 and 4, respectively.
Initial cooling temperature effecting on bending and section sizes of cold heavy rail Thermo-mechanical coupling module of software Ansys is applied to numerical simulation on 60kg/m U75V heavy rail in the initial temperature respectively of 950℃, 900℃, 870℃ and 850℃ during the cooling process, and it is found that the bending and the section size change of cooling after heavy rail in different initial cooling temperature.
Online since: May 2004
Authors: Ke Xin Chen, Jun Ming Guo, José Maria F. Ferreira, Ren Li Fu
Introduction
The ternary carbide is a kind of compound comprising covalent, metallic and ionic bonds in one
crystal cell, which results in unusual properties combining the merits of both metals and ceramics.
Normally, the fabrication of Ti2AlC1-x ceramic parts needs very rigorous conditions, such as high mechanical pressure and long sintering times [5,6].
Comparing the ratio of Ti:Al:C = 3:1.5:1 for sample TAC3151 to the stoichiometric ratio of Ti2AlC, one may conclude that there were surplus amounts of Ti and Al elements by a factor of 1.5.
Recent research results indicated that the Ti:C ratio in the starting Ti-Al-C system greatly affected the phase formation in the combustion products, while the amount of Al in the raw mixture affected the phase formation in a negligible extent [8].
The combustion temperature is another key factor in the combustion synthesis of Ti2AlC1-x.
Normally, the fabrication of Ti2AlC1-x ceramic parts needs very rigorous conditions, such as high mechanical pressure and long sintering times [5,6].
Comparing the ratio of Ti:Al:C = 3:1.5:1 for sample TAC3151 to the stoichiometric ratio of Ti2AlC, one may conclude that there were surplus amounts of Ti and Al elements by a factor of 1.5.
Recent research results indicated that the Ti:C ratio in the starting Ti-Al-C system greatly affected the phase formation in the combustion products, while the amount of Al in the raw mixture affected the phase formation in a negligible extent [8].
The combustion temperature is another key factor in the combustion synthesis of Ti2AlC1-x.
Online since: December 2013
Authors: Qiu Hua Chen, Xu Lai, Jin Zou
Introduction
The wind turbines extract kinetic energy from the free stream and convert it into mechanical energy of wind rotors, resulting a region of decreased wind speed and increased turbulence where is called wind turbine wake region.
In the large-scale wind farms, the impact of wake on the wind farm performance is up to 10%~20%[1] and thus becomes one of the key factors affecting the optimal placement of wind turbines.
Wood,The near wake of a model horizontal-axis wind turbine: Part 3: properties of the tip and hub vortices,Renewable Energy.
In the large-scale wind farms, the impact of wake on the wind farm performance is up to 10%~20%[1] and thus becomes one of the key factors affecting the optimal placement of wind turbines.
Wood,The near wake of a model horizontal-axis wind turbine: Part 3: properties of the tip and hub vortices,Renewable Energy.
Online since: August 2014
Authors: Jiao Tao Wang, Li Zhi Gu, Wei Wen Du
Introduction
The low-frequency vibration cutting system is a complex dynamic system with nonlinear factors.
The vibration parameters and cutting parameters affect each other, and are also relatively independent.
The low-frequency vibration cutting system is a complex dynamic system with nonlinear factors.
Table 1 Low frequency vibration cutting experiment data Factors Test No.
In order to further verify the properties of the surface roughness prediction models, the data in table 1 are used to predict by the methods based on LS-SVM, SVM and BP neural network.
The vibration parameters and cutting parameters affect each other, and are also relatively independent.
The low-frequency vibration cutting system is a complex dynamic system with nonlinear factors.
Table 1 Low frequency vibration cutting experiment data Factors Test No.
In order to further verify the properties of the surface roughness prediction models, the data in table 1 are used to predict by the methods based on LS-SVM, SVM and BP neural network.
Online since: July 2012
Authors: Fei Sun, Jian Xin Zhang, Jian Jun Cui
In particular, the addition of Ru has generated research interest as a promising element, due to its significant contributions to an enhanced microstructure stability and high-temperature mechanical properties of Ni-based single-crystal superalloys [24, 25].
Recently, several different theoretical methods have been used to elucidate the alloying mechanisms controlling the mechanical properties of Ni-based single-crystal superalloys [19, 26-29].
Our work provides a theoretical basis for further studying the role of refractory elements in controlling the mechanical properties of Ni-based superalloys.
In addition, high-temperature mechanical properties of superalloys can be enhanced by Re due to its low diffusivity as well as its tendency to form clusters in superalloys [38-42].
Ru remarkably affects the site preference of W, Re and Cr in γ′-Ni3Al.
Recently, several different theoretical methods have been used to elucidate the alloying mechanisms controlling the mechanical properties of Ni-based single-crystal superalloys [19, 26-29].
Our work provides a theoretical basis for further studying the role of refractory elements in controlling the mechanical properties of Ni-based superalloys.
In addition, high-temperature mechanical properties of superalloys can be enhanced by Re due to its low diffusivity as well as its tendency to form clusters in superalloys [38-42].
Ru remarkably affects the site preference of W, Re and Cr in γ′-Ni3Al.
Online since: August 2023
Authors: Ikram El Abbassi, Driss Taoukil, Oussama Zine, Mohamed Ouakarrouch, El Hadj Kadri, Mohammed lhassane Lahlaouti, Abdelmajid El Bouardi
Hemp-based composites for thermal properties measurement (parallelepiped shape)
Fig.6.
Thermal properties of hemp-based composites · Thermal conductivity Fig.10.
Bhattacharyya, Biocomposites from waste derived biochars: Mechanical, thermal, chemical, and morphological properties, Waste Manag. 49 (2016) 560–570
Pásztory, An overview of factors influencing thermal conductivity of building insulation materials, J.
Goudet, Mechanical and thermal properties of lime and hemp concrete (‘hempcrete’) manufactured by a projection process, Constr.
Thermal properties of hemp-based composites · Thermal conductivity Fig.10.
Bhattacharyya, Biocomposites from waste derived biochars: Mechanical, thermal, chemical, and morphological properties, Waste Manag. 49 (2016) 560–570
Pásztory, An overview of factors influencing thermal conductivity of building insulation materials, J.
Goudet, Mechanical and thermal properties of lime and hemp concrete (‘hempcrete’) manufactured by a projection process, Constr.
Online since: January 2005
Authors: Tamaz Eterashvili, M. Vardosanidze
If the radius of the relaxation volume ( R ) is much less then
the length of the crack (L), the stress in the middle of the crack
practically will not be affected by the plastic relaxation.
In the present paper an attempt is made to exclude this factor from the equation (1).
The latter fact can be understood because the mathematical models were developed for the elastic-plastic bodies, the properties of which are homogeneous and time independent.
Naturally, all these factors substantially influence both shape and location of plastic zone with regard a microcrack.
Machida…, "Fracture mechanical modeling of brittle crack propagation and arrest of steel ", Dynamic Fracture, Failure and Deformation, PVP-Vol. 300, ASME (1995), pp. 183-195
In the present paper an attempt is made to exclude this factor from the equation (1).
The latter fact can be understood because the mathematical models were developed for the elastic-plastic bodies, the properties of which are homogeneous and time independent.
Naturally, all these factors substantially influence both shape and location of plastic zone with regard a microcrack.
Machida…, "Fracture mechanical modeling of brittle crack propagation and arrest of steel ", Dynamic Fracture, Failure and Deformation, PVP-Vol. 300, ASME (1995), pp. 183-195