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Online since: August 2014
Authors: Stepan A. Dmitriev, Alexandra I. Khalyasmaa, Daniil A. Glushkov, Ivan P. Nikonov, Kirill A. Zinoviev
Insulation quality, electric and mechanical properties considerably define equipment and apparatus design and characteristics.
Insulation quality, electric and mechanical properties considerably define equipment and apparatus design and characteristics.
PI core is an internal insulating element which provides desired mechanical properties of the insulator.
Silicon appeared to be the most reliable polymeric material in operation, it provides PI surface electric strength and glass fiber core protection against environmental factors.
Minimum mass-dimensional properties.
Insulation quality, electric and mechanical properties considerably define equipment and apparatus design and characteristics.
PI core is an internal insulating element which provides desired mechanical properties of the insulator.
Silicon appeared to be the most reliable polymeric material in operation, it provides PI surface electric strength and glass fiber core protection against environmental factors.
Minimum mass-dimensional properties.
Online since: June 2008
Authors: Wei Li, Qing Li, Chaiy Rungsiyakull, Richard Appleyard, Michael Swain
Osseointegration that
was defined as "direct structural and functional connection between ordered living bone and the
surface of a load-bearing implant" [1] becomes one of the most critical factors to determine the
clinical success of implantation.
Bone signifies a living tissue constantly regulating itself in response to mechanical loads by adapting its internal morphology and properties for accommodating the fundamental loading environment.
The corresponding properties such as Young's modulus and Poisson ratio were determined from values obtained from the literature [2].
More importantly, the study revealed that the particle size of fully porous coating also appreciably affected the remodeling capability by assessing the minimum effective strain (MES).
[10] Carter, D.R., Mechanical Loading Histories and Cortical Bone Remodeling.
Bone signifies a living tissue constantly regulating itself in response to mechanical loads by adapting its internal morphology and properties for accommodating the fundamental loading environment.
The corresponding properties such as Young's modulus and Poisson ratio were determined from values obtained from the literature [2].
More importantly, the study revealed that the particle size of fully porous coating also appreciably affected the remodeling capability by assessing the minimum effective strain (MES).
[10] Carter, D.R., Mechanical Loading Histories and Cortical Bone Remodeling.
Online since: November 2013
Authors: Mohsen Izadinia, Arash Khosravi, Amir Mahdi Moslemi, Mohaddeseh Heydari
Nano Silica is high pozzolanic material which is used recently in concrete to improve its mechanical properties.
Introduction Several factors are important in durability of concrete structure, such as permeability of concrete, concentration of sulfate and type of structure [1].
This is an important factor in permeability of concrete specimens which affects the resistance of concrete toward the sulfate attack[4].
Physical properties of Nano Silica Phase Specific gravity Ave particles size (nm) pH Electrical conductivity (mS/cm) Nano-SiO2 Clear liquid (colloid) 1.10 2.1 9-11 3.47 The properties of fine and coarse aggregate which is used in this study are shown in Table 2.
Properties of aggregate in concrete specimens Aggregate Max size (mm) Finesse Module (FM) Density(gr/cm3) Water absorption (%) Gravel 19 4.96 2.58 1.74 Sand 2.56 2.3 Preparation and testing procedure.
Introduction Several factors are important in durability of concrete structure, such as permeability of concrete, concentration of sulfate and type of structure [1].
This is an important factor in permeability of concrete specimens which affects the resistance of concrete toward the sulfate attack[4].
Physical properties of Nano Silica Phase Specific gravity Ave particles size (nm) pH Electrical conductivity (mS/cm) Nano-SiO2 Clear liquid (colloid) 1.10 2.1 9-11 3.47 The properties of fine and coarse aggregate which is used in this study are shown in Table 2.
Properties of aggregate in concrete specimens Aggregate Max size (mm) Finesse Module (FM) Density(gr/cm3) Water absorption (%) Gravel 19 4.96 2.58 1.74 Sand 2.56 2.3 Preparation and testing procedure.
Online since: August 2017
Authors: Grzegorz Struzikiewicz, Ksenia Rumian
Introduction
The selection procedure of machining conditions is a complex process and there are numerous factors that should be taken into consideration.
The development of metallurgy resulted in the improvement of many properties of alloys, but at the same time caused a significantly more difficult machining process of those alloys.
Some factors related to the procedure of the cutting parameters selection have a great significance for the environment protections, such as the elimination of the cooling during cutting process.
Due to the fact two determining factors of the shape and dimensional accuracy and the changes of field temperature and cutting force distribution are that the value of the feed and cutting speed, those two parameters were assumed as variables f and vc respectively.
Graphic representation of the effect of variables on a mean value of the specific cutting force kc (a) and S/N signal (b) The results of the analysis show that the most important parameter affecting to the value of cut resistance is the feed.
The development of metallurgy resulted in the improvement of many properties of alloys, but at the same time caused a significantly more difficult machining process of those alloys.
Some factors related to the procedure of the cutting parameters selection have a great significance for the environment protections, such as the elimination of the cooling during cutting process.
Due to the fact two determining factors of the shape and dimensional accuracy and the changes of field temperature and cutting force distribution are that the value of the feed and cutting speed, those two parameters were assumed as variables f and vc respectively.
Graphic representation of the effect of variables on a mean value of the specific cutting force kc (a) and S/N signal (b) The results of the analysis show that the most important parameter affecting to the value of cut resistance is the feed.
Online since: December 2016
Authors: Martin Labaj, Karel Mikulica
The experimental part deals with the general assessment of the behavior and properties of foam concrete.
Besides the construction speed up and the overall cost reduction the improvement in mechanical properties of the roof structure has been achieved.
All though depends on the desired bulk density, dosage of expanded polystyrene beads and resulting physico-mechanical properties.
Well-designed foam concrete can achieve the same thermal insulating properties as the one with the addition of expanded polystyrene, while maintaining the physico-mechanical properties.
Production technology of cement foam concrete and their properties.
Besides the construction speed up and the overall cost reduction the improvement in mechanical properties of the roof structure has been achieved.
All though depends on the desired bulk density, dosage of expanded polystyrene beads and resulting physico-mechanical properties.
Well-designed foam concrete can achieve the same thermal insulating properties as the one with the addition of expanded polystyrene, while maintaining the physico-mechanical properties.
Production technology of cement foam concrete and their properties.
Online since: September 2013
Authors: Xiao Jin, Jian Wei Cui, Huan Wang
Experimental results showed that: 1.organic/inorganic hybrid nano-TiO2/PSt and nano-SiO2/PSt significantly affect the adhesion force of sizing agents and fibers.
Besides sizes constitute, the key factors which affect adhesion force between sizes and fibers also include the molecular structure of sizes, binding strength between macromolecules of sizes, sizes fluidity and so on.[3].
Because nano-particles have the characters of small size effect and big specific surface area[1,4], after full mixed with sizes matrix, it can play a role as cross-linking agent to form a combination with sizing agents, making macromolecules of sizing agents more closely, and enhancing the mechanical properties of sizes.
In the first place, since nanoparticles have the characters of small size effect and big specific surface area[1,4] , it can be easily added into inter- moleculars of polyacrylic acid size and play a role as cross-linking agent to form a combination with sizing agents, making sizing agents macromolecules more closely, strengthening the binding force among emulsion particles,sizing agents and fibers, and thus improving adhesion force of sizing agents and enhancing its mechanical properties.
Conclusions (1) Organic/inorganic hybrid nano-TiO2/PSt and nano-SiO2/PSt affect significantly on adhesion of sizing agents and fibers.
Besides sizes constitute, the key factors which affect adhesion force between sizes and fibers also include the molecular structure of sizes, binding strength between macromolecules of sizes, sizes fluidity and so on.[3].
Because nano-particles have the characters of small size effect and big specific surface area[1,4], after full mixed with sizes matrix, it can play a role as cross-linking agent to form a combination with sizing agents, making macromolecules of sizing agents more closely, and enhancing the mechanical properties of sizes.
In the first place, since nanoparticles have the characters of small size effect and big specific surface area[1,4] , it can be easily added into inter- moleculars of polyacrylic acid size and play a role as cross-linking agent to form a combination with sizing agents, making sizing agents macromolecules more closely, strengthening the binding force among emulsion particles,sizing agents and fibers, and thus improving adhesion force of sizing agents and enhancing its mechanical properties.
Conclusions (1) Organic/inorganic hybrid nano-TiO2/PSt and nano-SiO2/PSt affect significantly on adhesion of sizing agents and fibers.
Online since: July 2011
Authors: Yong Lu, Dong Gao, Ming Liang Zhang
Study on Flux-pinned Interaction between High-temperature Superconductor and Permanent Magnet and Flux-Pinning’s Self-Stability
Mingliang Zhanga, Yong Lub and Dong Gaoc
School of Mechanical and Electrical Engineering, Harbin Institute of Technology, Harbin, Heilongjiang, 150001, China
aniudun12@126.com, bluyong@hit.edu.cn, cgaodong@hit.edu.cn
Keywords: High-temperature superconductor, Flux-pinned Interface, Spring-damper Model, Image-Dipole Model, Self-stability.
In addition, the group in Cornell University confirms this concept with measurements of a FPI for potential use in passively connecting spacecraft structures without mechanical contact.
To simplify this model, the motion is only confined in vertical orient, so it becomes a mass-spring-damper system resembling to classical mechanical system.
First, the coefficient of damping for the model is above the zero and the different value largely affects the decline of time, with the shorter oscillation following the increase of.
The investigation into two models indicates that the flux-pinning’s property are validly demonstrated, the result is seen below: 1) With IDM, this paper validates that the force is dependent on plenty of factors and show the similar behavior of rapid decrease with the increasable separation in experiment. 2) This paper confirrms that flux pinning can constrain and pin all DOFs except the one about diploe axis by the mean of IDM. 3) Given some conditions, this paper demonstrates that the PM-HTSC has self-stability by above two models within inner interaction ,which provide a new potential for robust spacecraft.
In addition, the group in Cornell University confirms this concept with measurements of a FPI for potential use in passively connecting spacecraft structures without mechanical contact.
To simplify this model, the motion is only confined in vertical orient, so it becomes a mass-spring-damper system resembling to classical mechanical system.
First, the coefficient of damping for the model is above the zero and the different value largely affects the decline of time, with the shorter oscillation following the increase of.
The investigation into two models indicates that the flux-pinning’s property are validly demonstrated, the result is seen below: 1) With IDM, this paper validates that the force is dependent on plenty of factors and show the similar behavior of rapid decrease with the increasable separation in experiment. 2) This paper confirrms that flux pinning can constrain and pin all DOFs except the one about diploe axis by the mean of IDM. 3) Given some conditions, this paper demonstrates that the PM-HTSC has self-stability by above two models within inner interaction ,which provide a new potential for robust spacecraft.
Online since: June 2022
Authors: Lenka Klakurková, Ladislav Čelko, Michaela Remešová, David Paloušek, Vendula Bednaříková, Miroslava Horynová, Jan Suchý
Magnesium (Mg) and its alloys have been intensively investigated as potential biocompatible materials with appropriate structural, mechanical and corrosion properties for preferable orthopedic applications.
Introduction Magnesium and its alloys are interesting materials for biomedical research due to the combination of mechanical properties close to those of natural bone with their superior biocompatibility and biodegradability.
Magnesium and its degradation products are non-toxic, and it is an important co-factor for many enzymes, especially for DNA replication and repair processes [3].
The average pH value of HBSS after testing was 9.3, confirming that process involved the release of hydrogen led by the alkalinization of the environment mainly affected by the formation of Mg(OH)2 [8].
Ding, Biocorrosion properties of as-extruded Mg–Nd–Zn–Zr alloy compared with commercial AZ31 and WE43 alloys, Mater.
Introduction Magnesium and its alloys are interesting materials for biomedical research due to the combination of mechanical properties close to those of natural bone with their superior biocompatibility and biodegradability.
Magnesium and its degradation products are non-toxic, and it is an important co-factor for many enzymes, especially for DNA replication and repair processes [3].
The average pH value of HBSS after testing was 9.3, confirming that process involved the release of hydrogen led by the alkalinization of the environment mainly affected by the formation of Mg(OH)2 [8].
Ding, Biocorrosion properties of as-extruded Mg–Nd–Zn–Zr alloy compared with commercial AZ31 and WE43 alloys, Mater.
Online since: July 2011
Authors: Dao Lin Gao, Tian Long Deng, Shi Qiang Wang, Ya Fei Guo, Yan Rong Tang
Sharma [5] and Farid [6] gave a good overview of the properties of inorganic salt hydrates in general.
Table 1 Important characteristics of phase change materials Properties Characteristics of each property Thermal properties suitable of phase transition temperature; high latent heat of transition; good heat transfer Kinetic properties no supercooling; sufficient crystallization rate Physical properties favorable phase equilibrium; high density; small volume change; low vapor pressure Chemical properties long-term chemical stability; compatibility with building materials; no toxicity; nonflammability Economics abundant; bargain Supercooling and the methods to deal with supercooling of inorganic salt hydrates There are a number of papers describing supercooling of salt hydrates [7-15].
The absorbency of SAP was mainly dependent on factors such as the osmotic pressure from the mobile ion concentration, the molecular chain expansion resulting from electrical repulsion and the extent of cross linkage affecting the degree of swelling of the polymer [20].
In addition, other techniques used to overcome inevitable phase separation are corresponding to encapsulating the PCM, mechanical stirring, modifying the chemical composition of the system and making incongruent material congruent, and agitation [21-24].
The supercooling and phase separation affect their phase change properties.
Table 1 Important characteristics of phase change materials Properties Characteristics of each property Thermal properties suitable of phase transition temperature; high latent heat of transition; good heat transfer Kinetic properties no supercooling; sufficient crystallization rate Physical properties favorable phase equilibrium; high density; small volume change; low vapor pressure Chemical properties long-term chemical stability; compatibility with building materials; no toxicity; nonflammability Economics abundant; bargain Supercooling and the methods to deal with supercooling of inorganic salt hydrates There are a number of papers describing supercooling of salt hydrates [7-15].
The absorbency of SAP was mainly dependent on factors such as the osmotic pressure from the mobile ion concentration, the molecular chain expansion resulting from electrical repulsion and the extent of cross linkage affecting the degree of swelling of the polymer [20].
In addition, other techniques used to overcome inevitable phase separation are corresponding to encapsulating the PCM, mechanical stirring, modifying the chemical composition of the system and making incongruent material congruent, and agitation [21-24].
The supercooling and phase separation affect their phase change properties.
Online since: June 2021
Authors: Ubolrat Wangrakdiskul, Natthakitta Piyarat, Purinut Maingam
Effects of boric acid on the physical properties of ceramic bodies were investigated.
Therefore, the results showed low shrinkage led to high water absorption, but did not affect the mechanical strength [4].
Table 3 The physical properties and fluxing agent of 4 groups fired at 850°C (Group A) Group no.
Table 4 The physical properties and fluxing agent of 4 groups fired at 900°C (Group B) Group no.
In addition, formula A2-0 fired at 850°C (see Fig. 1c) that a large porous structure is formed by incorporating sediment soil affecting in low flexural strength than formula B2-0 fired at 900°C (see Fig. 1d).
Therefore, the results showed low shrinkage led to high water absorption, but did not affect the mechanical strength [4].
Table 3 The physical properties and fluxing agent of 4 groups fired at 850°C (Group A) Group no.
Table 4 The physical properties and fluxing agent of 4 groups fired at 900°C (Group B) Group no.
In addition, formula A2-0 fired at 850°C (see Fig. 1c) that a large porous structure is formed by incorporating sediment soil affecting in low flexural strength than formula B2-0 fired at 900°C (see Fig. 1d).