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Online since: June 2023
Authors: Chaimae Abadi, Imad Manssouri, Mohammed Abadi, Asmae Abadi, Hassane Sahbi
Actually, through a set of object and data properties, namely: the "HasAlternative", and the "IsCharacterizedWith" object properties and also the "HasValue" data property that affect a real value to each property characterizing the industrialization problem, the different process alternatives of a specific production line module are defined.
Then, each property is affected to an interval of values which limits it.
To do so, two data properties, namely the "HasHigherLimit" and the "HasLowerLimit" data properties, are defined in the EPD-Onto.
Figs. 5 and 6 present the different classes, object properties and data properties of the proposed ontology.
A Novel Perspective on Travel Demand Prediction Considering Natural Environmental and Socioeconomic Factors, in: IEEE Intelligent Transportation Systems Magazine, 2022
Then, each property is affected to an interval of values which limits it.
To do so, two data properties, namely the "HasHigherLimit" and the "HasLowerLimit" data properties, are defined in the EPD-Onto.
Figs. 5 and 6 present the different classes, object properties and data properties of the proposed ontology.
A Novel Perspective on Travel Demand Prediction Considering Natural Environmental and Socioeconomic Factors, in: IEEE Intelligent Transportation Systems Magazine, 2022
Online since: February 2013
Authors: Hasse Fredriksson, Mitra Basirat
This band structure has been reported to affect the final mechanical properties of steels [4].
The important factors controlling the kinetics of cementite dissolution are alloying elements, temperature and size.
The temperature before quenching seems to affect the crack propagation.
The important factors controlling the kinetics of cementite dissolution are alloying elements, temperature and size.
The temperature before quenching seems to affect the crack propagation.
Online since: July 2013
Authors: Ming Zhou, Guo Jun Dong, Ming Wang
Dynamic Modeling and Simulation Analysis for Rotary Ultrasonic Machining of SiCp/Al Thin-walled Structure
Ming Wang1, 2, a, Guojun Dong1,b, Ming Zhou1, c
1School of Mechanical and Electrical Engineering, Harbin Institute of Technology, Harbin 150001, P.R.
The processing of SiCp/Al thin-walled components faces many problems because SiCp/Al composite is extremely difficult to machine due to their extreme abrasive properties.
The chatter is a major factor that greatly affects the accuracy and the efficiency of the machining process.
Therefore, workpiece regeneration effect is a major factor and wheel eccentricity and diamond wheel regeneration effect could be ignored in the dynamic model of RUM of SiCp/Al composite thin-walled workpiece.
The first order modal parameters of system affect machining chatter greatly, and the influence of higher modal parameters is very small, therefore the stability analyzing of machining chatter only aim at the first order modal of system.
The processing of SiCp/Al thin-walled components faces many problems because SiCp/Al composite is extremely difficult to machine due to their extreme abrasive properties.
The chatter is a major factor that greatly affects the accuracy and the efficiency of the machining process.
Therefore, workpiece regeneration effect is a major factor and wheel eccentricity and diamond wheel regeneration effect could be ignored in the dynamic model of RUM of SiCp/Al composite thin-walled workpiece.
The first order modal parameters of system affect machining chatter greatly, and the influence of higher modal parameters is very small, therefore the stability analyzing of machining chatter only aim at the first order modal of system.
Online since: September 2011
Authors: Wen Tao Xu, Tong Chen Miao, Xu Zhang
Hence a change in arch rib stiffness can significantly affect the dynamic performance of the bridge system.
Table 5 The natural frequencies results for changing boundary conditions Order Constraint 1 Constraint 2 Constraint 3 Constraint 4 Constraint 5 Constraint 6 Constraint 7 1 0.620 0.620 0.620 0.620 0.615 0.608 0.538 2 1.292 1.293 1.294 1.264 1.288 1.275 0.608 3 1.630 1.302 1.630 1.294 1.596 1.617 0.682 4 2.200 2.200 2.200 2.200 2.183 1.987 1.219 5 2.268 2.248 2.268 2.247 2.220 2.266 1.344 As can be seen from table 5, changes of the system frequency in constraint 6 and 7, this is mainly due to removing the link in the constraint 6 and 7, this show that the links of the bridge system significantly affect the power system of the suspension arch bridge, the effect is not significant in other constraint boundary conditions change.
Conclusions (1) Dynamic properties show that the stiffness of suspension arch bridge in plane is greater than out of plane, the horizontal stiffness is smaller, the overall stiffness and torsion performance of the arch are better, the cable-arch stiffness is less than the bridge deck stiffness; (2) The fundamental frequency is higher, vibration modes are sparser, the change of the vibration modes shape after 10-order tends to ease; (3) The increase of suspension cable stiffness on the vibration characteristics of the bridge structure has no obvious effect; (4) The influence of constant-load change on dynamic characteristics of suspended arch bridge is not obvious; (5) The influence on the dynamic characteristics of the suspension arch bridge is more significant while considering separately the changes of arch rib stiffness and bridge frame stiffness, especially the influence on the torsion vibration of suspension arch bridge; The influence on the dynamic characteristics of the suspension
In summary, the above conclusions should be considered during the calculation and design for the suspension arch bridge and the influence of various factors on the dynamic characteristics of suspension arch bridge should be analyzed.
(In Chinese) [6] Xiaofei Yao, Mechanical Analysis of a Steel Truss Suspension Bridge (Master thesis).
Table 5 The natural frequencies results for changing boundary conditions Order Constraint 1 Constraint 2 Constraint 3 Constraint 4 Constraint 5 Constraint 6 Constraint 7 1 0.620 0.620 0.620 0.620 0.615 0.608 0.538 2 1.292 1.293 1.294 1.264 1.288 1.275 0.608 3 1.630 1.302 1.630 1.294 1.596 1.617 0.682 4 2.200 2.200 2.200 2.200 2.183 1.987 1.219 5 2.268 2.248 2.268 2.247 2.220 2.266 1.344 As can be seen from table 5, changes of the system frequency in constraint 6 and 7, this is mainly due to removing the link in the constraint 6 and 7, this show that the links of the bridge system significantly affect the power system of the suspension arch bridge, the effect is not significant in other constraint boundary conditions change.
Conclusions (1) Dynamic properties show that the stiffness of suspension arch bridge in plane is greater than out of plane, the horizontal stiffness is smaller, the overall stiffness and torsion performance of the arch are better, the cable-arch stiffness is less than the bridge deck stiffness; (2) The fundamental frequency is higher, vibration modes are sparser, the change of the vibration modes shape after 10-order tends to ease; (3) The increase of suspension cable stiffness on the vibration characteristics of the bridge structure has no obvious effect; (4) The influence of constant-load change on dynamic characteristics of suspended arch bridge is not obvious; (5) The influence on the dynamic characteristics of the suspension arch bridge is more significant while considering separately the changes of arch rib stiffness and bridge frame stiffness, especially the influence on the torsion vibration of suspension arch bridge; The influence on the dynamic characteristics of the suspension
In summary, the above conclusions should be considered during the calculation and design for the suspension arch bridge and the influence of various factors on the dynamic characteristics of suspension arch bridge should be analyzed.
(In Chinese) [6] Xiaofei Yao, Mechanical Analysis of a Steel Truss Suspension Bridge (Master thesis).
Online since: September 2011
Authors: Ying Yi Zhang, Yun Gang Li, Kuai Zhang, Ying Tian
The key is to improve the processing arts of biscuit firming and sintering, and to solve problems caused by large discreteness of resistors and poor mechanical properties of SiC.
They have good consistency and their properties meet the technical requirements on furnace production.
However, the main factors affecting its ability of conductivity are the type of dosage, the size of ZrO2 grain, porosity, the environmental temperature and so on.
Besides, there are also other factors which greatly restrict the development and application of ZrO2 such as its complex thermal expansion curves and poor thermal shock.
(4) MoSi2, as an intermetallic compound of metal and ceramics, has the dual properties of metals and ceramics.
They have good consistency and their properties meet the technical requirements on furnace production.
However, the main factors affecting its ability of conductivity are the type of dosage, the size of ZrO2 grain, porosity, the environmental temperature and so on.
Besides, there are also other factors which greatly restrict the development and application of ZrO2 such as its complex thermal expansion curves and poor thermal shock.
(4) MoSi2, as an intermetallic compound of metal and ceramics, has the dual properties of metals and ceramics.
Online since: September 2011
Authors: Lei Jiang, Guan Guo Liu, Xiong Wen Zhang
Water transport is an important parameter that affects the long term performance and degradation of concrete greatly.
Introduction Water transport is a key factor influencing the long term performance and degradation of concrete by both physical and chemical means.
Table 1 Chemical properties of cement and fly ash Oxide CaO SiO2 Al2O3 MgO SO3 Fe2O3 LOI Cement 63.11 22.60 5.03 1.46 2.24 4.38 1.18 Fly Ash 4.77 54.88 26.89 1.31 1.61 6.49 1.02 Table 2 Mix proportions of concrete Concrete w/b Mix proportion (kg/m3) Cement Fly ash Water Sand Stone F0 0.35 443.0 0 155 692 1130 F60 0.35 117.3 265.7 155 692 1130 Equipment.
The samples were firstly mechanical mixed and cast into mould.
Introduction Water transport is a key factor influencing the long term performance and degradation of concrete by both physical and chemical means.
Table 1 Chemical properties of cement and fly ash Oxide CaO SiO2 Al2O3 MgO SO3 Fe2O3 LOI Cement 63.11 22.60 5.03 1.46 2.24 4.38 1.18 Fly Ash 4.77 54.88 26.89 1.31 1.61 6.49 1.02 Table 2 Mix proportions of concrete Concrete w/b Mix proportion (kg/m3) Cement Fly ash Water Sand Stone F0 0.35 443.0 0 155 692 1130 F60 0.35 117.3 265.7 155 692 1130 Equipment.
The samples were firstly mechanical mixed and cast into mould.
Online since: December 2012
Authors: Abdul Razak Khairunisak, Dyana Zakaria Nor, Azwana Ab Wab Hajarul, Abdul Aziz Azlan
The properties of silica based DDS can be easily tuned by changing the synthesis parameters such as the temperature, surfactant and chemical composition of the silica precursor itself [1-2].
In this work, the amount of Tween 80 surfactant and different types of drugs were varied to investigate the properties of DDS.
Diameter of micelles formed was affected by the amount of surfactant.
This could be due to the difference in solubility properties of these drugs.
Different types of drug resulted in different size of silica DDS because of the drug properties.
In this work, the amount of Tween 80 surfactant and different types of drugs were varied to investigate the properties of DDS.
Diameter of micelles formed was affected by the amount of surfactant.
This could be due to the difference in solubility properties of these drugs.
Different types of drug resulted in different size of silica DDS because of the drug properties.
Online since: December 2016
Authors: Ondřej Holčapek, Martin Petřík, Petr Štemberk, Yuliia Khmurovska, Ippei Maruyama
The bonding properties are investigated in recent years and outcomes of these studies, [1-8], helped to focus the research work reported in this paper.
The top and the bottom layers represent concrete plates of different properties with dimensions of 4 x 4 x 1 cm, the middle layer represents the polymer cement (Fig. 3).
The thermal and mechanical properties of the modeled specimen are described in Table 1.
The thermal and mechanical properties of materials.
Mechanical and fracture properties of cement-based bi-materials after thermal cycling.
The top and the bottom layers represent concrete plates of different properties with dimensions of 4 x 4 x 1 cm, the middle layer represents the polymer cement (Fig. 3).
The thermal and mechanical properties of the modeled specimen are described in Table 1.
The thermal and mechanical properties of materials.
Mechanical and fracture properties of cement-based bi-materials after thermal cycling.
Online since: January 2016
Authors: Mohd Mustafa Al Bakri Abdullah, Januarti Jaya Ekaputri, Triwulan Triwulan, Fahmi Firdaus Alrizal, Iqbal Husein
The cracks can be initiated by two aspects: internal and external factors.
Internal factors caused by the shrinkage of concrete material whereas external factors caused by several mechanisms, including excessive load, exposure to aggressive environments, procedures of construction and design errors [1].
A factor of 0.83 was applied for converting cube compressive strength into the cylinder compressive strength.
However, at some other studies, continued hydration of the cement matrix does not significantly affect the healing of cracks.
The addition of rice husk ash (RHA) to replace cement combined with 10% CaCO3 affect and accelerate the healing process.
Internal factors caused by the shrinkage of concrete material whereas external factors caused by several mechanisms, including excessive load, exposure to aggressive environments, procedures of construction and design errors [1].
A factor of 0.83 was applied for converting cube compressive strength into the cylinder compressive strength.
However, at some other studies, continued hydration of the cement matrix does not significantly affect the healing of cracks.
The addition of rice husk ash (RHA) to replace cement combined with 10% CaCO3 affect and accelerate the healing process.
Online since: August 2014
Authors: Kristina Buchhöcker, Volker Schulze, Jürgen Hoffmeister, Manfred Bacher-Höchst, Elisabeth Herz
To describe the state of the material, the properties are
determined at the very surface.
This indicates that the underlying assumptions regarding the scatter of the surface properties as well as their superposition over all finite elements are appropriate.
It needs to be investigated whether the ECM specimens with R = −1 are subjected to significant plastification, as this would affect the determination of R0w, 50% and vc
• Topography: The micro-notch factor Ktopo is derived from averaged values of the surface microgeometry.
Klemenz: Correlation of mechanical surface treatments, induced surface states and fatigue performance of steel components, Procedia Engineering 19 (2011) [11] J.
This indicates that the underlying assumptions regarding the scatter of the surface properties as well as their superposition over all finite elements are appropriate.
It needs to be investigated whether the ECM specimens with R = −1 are subjected to significant plastification, as this would affect the determination of R0w, 50% and vc
• Topography: The micro-notch factor Ktopo is derived from averaged values of the surface microgeometry.
Klemenz: Correlation of mechanical surface treatments, induced surface states and fatigue performance of steel components, Procedia Engineering 19 (2011) [11] J.