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Online since: August 2015
Authors: Radim Čajka, Kamil Burkovič
In past, the structures were affected by mining activities which ceased after the Odra Coal Mine had been shut down.
This is the evidence that the building has been exposed throughout its service life to undermining factors.
Procedia Engineering ,Volume 65, Pages 266-272, ISSN: 18777058, DOI: 10.1016/j.proeng.2013.09.041, 2013 [6] STARA, M., JANULIKOVA,M., Laboratory Measurements and Numerical Modeling of Pre-stressed Masonry, Procedia Engineering, Volume 65, Pages 411-416, ISSN 1877-7058, doi: 10.1016/j.proeng.2013.09.064., 2013 [7] KARMAZINOVA, M., MELCHER,J., On problems of mechanical properties of structural steel in load-carrying structure of historical building construction.
This is the evidence that the building has been exposed throughout its service life to undermining factors.
Procedia Engineering ,Volume 65, Pages 266-272, ISSN: 18777058, DOI: 10.1016/j.proeng.2013.09.041, 2013 [6] STARA, M., JANULIKOVA,M., Laboratory Measurements and Numerical Modeling of Pre-stressed Masonry, Procedia Engineering, Volume 65, Pages 411-416, ISSN 1877-7058, doi: 10.1016/j.proeng.2013.09.064., 2013 [7] KARMAZINOVA, M., MELCHER,J., On problems of mechanical properties of structural steel in load-carrying structure of historical building construction.
Online since: October 2018
Authors: S.B. Mikhailov, N.A. Mikhailova, Valentina A. Sharapova
At the same time, the change in the type of laying "BCC → FCC" significantly affected the level of LCTE values by an average of 30-35% without changing the shape of the dependencies themselves (Fig. 1).
On the basis of this, it was suggested [5] that formally the shape of all LCTE curves can be interpreted as a curve of logarithmic dependence with allowance for corrections-vacancy and quantum mechanical for temperatures above 0.5 from the melting point and below room temperature, respectively (Fig. 2).
In this case, the information about the atoms forming the basic packing of the material structure reflects the value of the pre-logarithmic factor of equation (1) describing the logarithmic relationship [5, 6].
The presence of this dependence indicates the fundamental importance of the pre-logarithmic factor "A" as a parameter reflecting the force interaction between atoms.
Neimark, Physical Properties of Steels and Alloys used in Power Engineering, reference book, Energia, Moscow, 1967
On the basis of this, it was suggested [5] that formally the shape of all LCTE curves can be interpreted as a curve of logarithmic dependence with allowance for corrections-vacancy and quantum mechanical for temperatures above 0.5 from the melting point and below room temperature, respectively (Fig. 2).
In this case, the information about the atoms forming the basic packing of the material structure reflects the value of the pre-logarithmic factor of equation (1) describing the logarithmic relationship [5, 6].
The presence of this dependence indicates the fundamental importance of the pre-logarithmic factor "A" as a parameter reflecting the force interaction between atoms.
Neimark, Physical Properties of Steels and Alloys used in Power Engineering, reference book, Energia, Moscow, 1967
Online since: May 2004
Authors: Gilbert Fantozzi, Jérôme Chevalier, Malika Saâdaoui, Hassan El Attaoui
During crack propagation under
cyclic loading, the compliance is affected by the frictional degradation of bridges (due to repeated
unloading and loading).
Sintering conditions and physical properties of alumina ceramics Nomenclature Sintering temperature Sintering time % theoretical density Mean grain size (µm) AKP4 1550 °C 2 h 97.4 4.2 µm AKP14 1750 °C 6 h 98.9 14.1 µm AKP19 1750 °C 12 h 99.3 19.8 µm R-Curves And Compliance analysis under static loading A compliance function φ has been recently proposed to give an insight into the crack bridging stresses along the crack wake [6-8].
When crack-bridging degradation is larger enough to promote slow crack growth (KItip larger than the threshold stress intensity factor KI0), the crack starts to grow.
This incubation period correspond to the duration needed for the mechanical fatigue to degrade the bridging, enough to obtain KItip>KI0. 0 0,5 1 1,5 2 2,5 3 3,5 4 0 5 10 15 20 Crack extension ∆∆∆∆a (mm) ΦΦΦΦ (mm) Cyclic fatigue Static fatigue Figure.3. φ-curves under static fatigue then under cyclic fatigue (Rf = 0.85) for AKP19 Conclusion The crack-propagation behavior of alumina was investigated under static and cyclic loading condition.
It should be kept in mind that the cyclic fatigue degradation is more pronounced for low crack rates, i.e. it is maximum around the threshold stress intensity factor KI0.
Sintering conditions and physical properties of alumina ceramics Nomenclature Sintering temperature Sintering time % theoretical density Mean grain size (µm) AKP4 1550 °C 2 h 97.4 4.2 µm AKP14 1750 °C 6 h 98.9 14.1 µm AKP19 1750 °C 12 h 99.3 19.8 µm R-Curves And Compliance analysis under static loading A compliance function φ has been recently proposed to give an insight into the crack bridging stresses along the crack wake [6-8].
When crack-bridging degradation is larger enough to promote slow crack growth (KItip larger than the threshold stress intensity factor KI0), the crack starts to grow.
This incubation period correspond to the duration needed for the mechanical fatigue to degrade the bridging, enough to obtain KItip>KI0. 0 0,5 1 1,5 2 2,5 3 3,5 4 0 5 10 15 20 Crack extension ∆∆∆∆a (mm) ΦΦΦΦ (mm) Cyclic fatigue Static fatigue Figure.3. φ-curves under static fatigue then under cyclic fatigue (Rf = 0.85) for AKP19 Conclusion The crack-propagation behavior of alumina was investigated under static and cyclic loading condition.
It should be kept in mind that the cyclic fatigue degradation is more pronounced for low crack rates, i.e. it is maximum around the threshold stress intensity factor KI0.
Online since: August 2011
Authors: Ding Hua Zhang, Jun Xue Ren, Chang Feng Yao, Xin Chun Huang
Introduction
Titanium alloy has become a wide range of materials in the aviation industry application with its excellent mechanical properties,however the titanium alloy materials have small coefficient of thermal conductivity, high chemistry activity, large friction coefficient and so on, the cutting tool wear is serious because of the cutting temperature increase in the titanium alloy processing, thus the titanium alloy processing efficiency was affected.
The milling parameter as shown in table 1 , the simulation by a single factor included spindle speed, feed per tooth, milling depth and width, each factor take four levels.
The milling parameter as shown in table 1 , the simulation by a single factor included spindle speed, feed per tooth, milling depth and width, each factor take four levels.
Online since: July 2025
Authors: Crismar Patacsil, Honey Mae Aquino
This suggests that the presence of starch affects the ex-situ ZnO’s binding properties and treatment stability.
Additionally, the presence of starch could modify the physical properties of the (pre-synthesized) ex-situ treatment, potentially affecting its originally stable properties (as observed when comparing SG3 and SG6).
Effect of ZnO nanoparticle agglomeration on UV-shielding properties and mechanical performance of modified wood.
Impact of nanoparticle agglomeration on the UV-protective properties of coatings: A study on ZnO and TiO₂ nanoparticles.
Effect of sodium hydroxide concentration on the properties of ZnO nanoparticles synthesized from zinc chloride.
Additionally, the presence of starch could modify the physical properties of the (pre-synthesized) ex-situ treatment, potentially affecting its originally stable properties (as observed when comparing SG3 and SG6).
Effect of ZnO nanoparticle agglomeration on UV-shielding properties and mechanical performance of modified wood.
Impact of nanoparticle agglomeration on the UV-protective properties of coatings: A study on ZnO and TiO₂ nanoparticles.
Effect of sodium hydroxide concentration on the properties of ZnO nanoparticles synthesized from zinc chloride.
Online since: January 2016
Authors: H.H. Ya, H. El-Sobky
The moduli could be varied using a new extrusion technology, which controls the fibre orientation pattern, hence, the mechanical properties.
Farley [12] stated that the orientation criteria of the fibres in FRP composite tubes really affect the mechanical properties and enhance the energy absorption performance.
The materials properties of fibre and matrix material used to prepare the pipe specimen in this study were shown in the Table 1.
A few sets of photograph were taken during the compression of the pipes for aid in understanding and observing the factor of failure.
Materials properties of fibres and matrix materials Property E-glass Polypropylene PP Polyethylene MDPE Polyethylene LDPE Density,r (kg/m3) Modulus, E (Gpa) Tensile stress, s (Mpa) Elongation % 2450 76 400 ksi 900 1.2 35 > 200 955 0.43 26 100-300 920 0.18 13 400-800 Table 2.
Farley [12] stated that the orientation criteria of the fibres in FRP composite tubes really affect the mechanical properties and enhance the energy absorption performance.
The materials properties of fibre and matrix material used to prepare the pipe specimen in this study were shown in the Table 1.
A few sets of photograph were taken during the compression of the pipes for aid in understanding and observing the factor of failure.
Materials properties of fibres and matrix materials Property E-glass Polypropylene PP Polyethylene MDPE Polyethylene LDPE Density,r (kg/m3) Modulus, E (Gpa) Tensile stress, s (Mpa) Elongation % 2450 76 400 ksi 900 1.2 35 > 200 955 0.43 26 100-300 920 0.18 13 400-800 Table 2.
Online since: February 2012
Authors: Hou Jun Lu, Hui Qiang Zhen, Dao Fang Chang
Design and Implementation of Container Terminal 3D Simulation Model Repository
HouJun Lu1, 2, a, HuiQiang Zhen1 and Daofang Chang2, b
1 College of Mechanical Engineering, Tongji University, Shanghai, China, 200092
2 Container Supply Chain Engineering Research Center, SHMTU, Shanghai, China, 201306
asmulhj@126.com, bsmucdf@126.com
Keywords: Container terminal, Simulation Model, function, Framework, Classification
Abstract. 3D visualization simulation is the important research method of port logistic production system, whereas the lack of uniform standard and interface of 3D simulation model, it is very difficult to share the simulation model resource, and which caused modeling repeatedly and developing efficiency lowly.
Container terminal 3D simulation model repository should be considered as the key factor of solving the problems of developing low-efficiency and model no reuse of logistic system.
Introduction As the important hub of container transportation, container terminal’s operation efficiency affects the whole service level of container supply chain logistic system directly.
It is an abstractive description of one object of logistic system in real world, always represents the multi-level information of simulation objects, which includes properties, geometric information, physic information and so on.
Container terminal 3D simulation model repository should be considered as the key factor of solving the problems of developing low-efficiency and model no reuse of logistic system.
Introduction As the important hub of container transportation, container terminal’s operation efficiency affects the whole service level of container supply chain logistic system directly.
It is an abstractive description of one object of logistic system in real world, always represents the multi-level information of simulation objects, which includes properties, geometric information, physic information and so on.
Online since: February 2014
Authors: Chuan Sheng Wang, Fu Xia Zhang, Wei Feng Zhang, Jia Hong Liu
Therefore, the lateral stiffness value is an important factor to test the quality of the tubular conveyor belt.
The lateral stiffness of the circular tube belt is an important indicator, which directly affects the overall performance and service life of conveyor belt, and also is the key to the formation of a rigid circular tube and pipe properties. [3] (1) If lateral stiffness is too large, it is difficult to form circular pipe.
The whole structure is a hexagonal and single motor driving mode , and the six point synchronous action can be achieved through the special mechanical driving.
The lateral stiffness of the circular tube belt is an important indicator, which directly affects the overall performance and service life of conveyor belt, and also is the key to the formation of a rigid circular tube and pipe properties. [3] (1) If lateral stiffness is too large, it is difficult to form circular pipe.
The whole structure is a hexagonal and single motor driving mode , and the six point synchronous action can be achieved through the special mechanical driving.
Online since: February 2014
Authors: Liu Lan Lin, Yu Jie Lu
Drug releasing was affected by drugs concentration and scaffold morphology[16].
SEM images were observed to analyze the microstructure influence factors.
Compressive property was evaluated with a material testing machine (BZ2.5/TS1S, Zwich/Roell Co., Germany).
Mechanical properties The slurry solid content of 40% scaffolds was fabricated.
Alveolar bone regeneration using absorbable poly(L-lactide-co-epsilon-caprolactone)/beta-tricalcium phosphate membrane and gelatin sponge incorporating basic fibroblast growth factor.
SEM images were observed to analyze the microstructure influence factors.
Compressive property was evaluated with a material testing machine (BZ2.5/TS1S, Zwich/Roell Co., Germany).
Mechanical properties The slurry solid content of 40% scaffolds was fabricated.
Alveolar bone regeneration using absorbable poly(L-lactide-co-epsilon-caprolactone)/beta-tricalcium phosphate membrane and gelatin sponge incorporating basic fibroblast growth factor.
Online since: January 2012
Authors: Lin Wang, Yong Sheng Shi, Yu Zhen Shi
The product is distinguished by its good selectivity, chemical stability, mechanical strength and thermostability
This research looks at hexavalent selenium (SeO42-) or selenate radical ion and is carried out to find the way to treat this substance.
Fig.3: The exchange rate curve of Se(Ⅵ) 2.2 Factors that affect the Se removal 2.2.1PH Value in Raw Water The Fig. 4 shows the effect of PH value on Se removal.
But the pH value in solution can affect the Se removal intended by ion exchange resin.
When the ion exchange happens, the equilibrium concentration that ion in resin phase can reach is affected by equilibrium concentration of such ion in water phase and operation temperature.
The pH of solution can affect the removal rate of selenium in raw water.
Fig.3: The exchange rate curve of Se(Ⅵ) 2.2 Factors that affect the Se removal 2.2.1PH Value in Raw Water The Fig. 4 shows the effect of PH value on Se removal.
But the pH value in solution can affect the Se removal intended by ion exchange resin.
When the ion exchange happens, the equilibrium concentration that ion in resin phase can reach is affected by equilibrium concentration of such ion in water phase and operation temperature.
The pH of solution can affect the removal rate of selenium in raw water.