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Online since: July 2011
Authors: Xu Wen Kong, Can Dong, Feng Chuan Gu, Hong Di Lv, Shi Qi Cui
Differ from the traditional concrete, HPC(High Performance Concrete) is regarded as the concrete which has the most comprehensive properties by the world because of its numerous superior properties such as high-durability, high-performance, high-strength and high-stability of volume.
C-S-H gel phase is the largest component of set cement system, although the difference on morphology is larger and the structure is not fixed, its structure is the main factor that decides the strength of set cement.
With the higher of the activity of silica powder, the strength of cement-based materials were enhanced at most, and then the secondary hydration reaction could be carried out between ultrafine powders and hydration products of cements Ca(OH)2, where after large amount of C-S-H gels would be generated, which could densify both of the slurry structure and interface transition zone, and better improve the micro-structure of cement-based materials and finally enhance the mechanical property of materials.
Through the observation of the micro-structure of cementing materials, it can be found that the joint use of slag and siliceous dust can reduce the amount of Ca(OH)2 crystal and affect its appearance; meanwhile the structure of concrete and the development of its performance can be influenced significantly.
C-S-H gel phase is the largest component of set cement system, although the difference on morphology is large and the structure is not very fixed, its structure is the main factor that decides the strength of set cement.
C-S-H gel phase is the largest component of set cement system, although the difference on morphology is larger and the structure is not fixed, its structure is the main factor that decides the strength of set cement.
With the higher of the activity of silica powder, the strength of cement-based materials were enhanced at most, and then the secondary hydration reaction could be carried out between ultrafine powders and hydration products of cements Ca(OH)2, where after large amount of C-S-H gels would be generated, which could densify both of the slurry structure and interface transition zone, and better improve the micro-structure of cement-based materials and finally enhance the mechanical property of materials.
Through the observation of the micro-structure of cementing materials, it can be found that the joint use of slag and siliceous dust can reduce the amount of Ca(OH)2 crystal and affect its appearance; meanwhile the structure of concrete and the development of its performance can be influenced significantly.
C-S-H gel phase is the largest component of set cement system, although the difference on morphology is large and the structure is not very fixed, its structure is the main factor that decides the strength of set cement.
Online since: March 2024
Authors: Lukáš Vrablik, Jan Prchal
A detailed summary of the experiments carried out so far with the fastenings embedded in UHPFRC is given in the Table 1 together with the material properties.
Vf is considered in Eq. 2 by the factor k.
However, despite the introduction of this factor, tests with vf = 2,0 % are only available.
Table 5 Failure modes of UHPFRC specimens, comparison of series (vf) and depth (hef), one sample for each type 1,5 % 2,0 % 2,5 % 25 F 25 H Not part of 1.5% series 35 F 35 H Not part of 1.5% series 45 F Influence of Parameters on Anchoring Properties Effect of fiber volume vf.
There is a significant difference between the properties of the UHPFRC from the smoothed surface (H) and from the surface from the mould (F).
Vf is considered in Eq. 2 by the factor k.
However, despite the introduction of this factor, tests with vf = 2,0 % are only available.
Table 5 Failure modes of UHPFRC specimens, comparison of series (vf) and depth (hef), one sample for each type 1,5 % 2,0 % 2,5 % 25 F 25 H Not part of 1.5% series 35 F 35 H Not part of 1.5% series 45 F Influence of Parameters on Anchoring Properties Effect of fiber volume vf.
There is a significant difference between the properties of the UHPFRC from the smoothed surface (H) and from the surface from the mould (F).
Online since: March 2022
Authors: Ludfi Djakfar, Lila Khamelda, Wisnumurti Wisnumurti
This is one of the factors limiting the ability of this technique to match the performance of HMA due to the non-optimal binding process of bitumen to asbuton which is associated with the incomplete extraction in asbuton.
The process of removing bitumen requires materials of the same nature and this is important to achieve a higher solubility as observed in the use of solvent molecules (solvent) and solute with similarities in structure and electrical properties based on the concept of "like dissolves like."
The existence of similarity in electrical properties usually produces a strong tensile force between the solvent and solute [25].
This method provides an initial estimate of the asphalt content selection for the mixture in laboratory or field experiments, and if necessary adjusted, to obtain the desired characteristics or special properties of the resulting asphalt mixture. 4.
H., Djamaluddin, R., “Mechanical Characteristics of Hotmix Cold Laid Containing Buton Granular Asphat (BGA) and Flux Oil as Wearing Course,” ARPN J.
The process of removing bitumen requires materials of the same nature and this is important to achieve a higher solubility as observed in the use of solvent molecules (solvent) and solute with similarities in structure and electrical properties based on the concept of "like dissolves like."
The existence of similarity in electrical properties usually produces a strong tensile force between the solvent and solute [25].
This method provides an initial estimate of the asphalt content selection for the mixture in laboratory or field experiments, and if necessary adjusted, to obtain the desired characteristics or special properties of the resulting asphalt mixture. 4.
H., Djamaluddin, R., “Mechanical Characteristics of Hotmix Cold Laid Containing Buton Granular Asphat (BGA) and Flux Oil as Wearing Course,” ARPN J.
Online since: April 2021
Authors: Ashwin Kumar Devaraj, Kiran Kumar V Acharya, Raviraja Adhikari
Hence, it could be manifested from these findings that the magnitude of CP was not affected by radial tears up to 75% width [13,43].
However, it fails to take into account the variation of the material properties within the soft tissues [28].
Future Recommendations Most of the experimental studies on knee joints were done on cadaveric specimens, which lack the dynamic properties of an in-vivo model.
Hence, future studies should be directed towards approaches to preserve the dynamic properties of the soft tissues.
Vail, “Biomechanical Factors in Tissue Engineered Meniscal Repair,” Clin.
However, it fails to take into account the variation of the material properties within the soft tissues [28].
Future Recommendations Most of the experimental studies on knee joints were done on cadaveric specimens, which lack the dynamic properties of an in-vivo model.
Hence, future studies should be directed towards approaches to preserve the dynamic properties of the soft tissues.
Vail, “Biomechanical Factors in Tissue Engineered Meniscal Repair,” Clin.
Online since: December 2015
Authors: J.D. Obayemi, O.S. Odusanya, Karen Malatesta, N. Anuku, C. Chi, S.O. Dozie-Nwachukwu, Y. Danyo, G. Etuk-Udo, W.O. Soboyejo
Introduction:
Since nanoparticles have large surface to volume ratios, their surface-related phenomena and surface properties are usually affected by slight changes in their size, shape and surrounding media.[1] Consequently, gold nanoparticles are very chemical reactive compared to bulk gold, which is known to be inert.
Seehra, Size-dependent properties of CdSe quantum dots.
Goodman, Onset of catalytic activity of gold clusters on Titania with the appearance of nonmetallic properties, Science, 281(5383) (1998) 1647-1650
Halas, Shape-controlled synthesis and surface plasmonic properties of metallic nanostructures.
Soker, Antiangiogenic properties of gold nanoparticles.
Seehra, Size-dependent properties of CdSe quantum dots.
Goodman, Onset of catalytic activity of gold clusters on Titania with the appearance of nonmetallic properties, Science, 281(5383) (1998) 1647-1650
Halas, Shape-controlled synthesis and surface plasmonic properties of metallic nanostructures.
Soker, Antiangiogenic properties of gold nanoparticles.
Online since: August 2021
Authors: Agus Purwanto, Hafid Khusyaeri, Dewi Pratiwi, Haris Ade Kurniawan, Anisa Raditya Nurohmah, Cornelius Satria Yudha
Besides, this method still takes into account the factors of production costs and safety.
Furthermore, sodium and lithium have similar mechanisms and physicochemical properties [17].
Apart from the availability of the original raw material, several other factors can be considered in increasing the production of hard carbon anode materials.
Jeong, Effects of poly(vinylidene fluoride) content on electrochemical properties of a graphite negative electrode in lithium secondary batteries, Key Eng.
Asfand, Effect of particle size on the physical properties of activated palm kernel shell for supercapacitor application, Key Eng.
Furthermore, sodium and lithium have similar mechanisms and physicochemical properties [17].
Apart from the availability of the original raw material, several other factors can be considered in increasing the production of hard carbon anode materials.
Jeong, Effects of poly(vinylidene fluoride) content on electrochemical properties of a graphite negative electrode in lithium secondary batteries, Key Eng.
Asfand, Effect of particle size on the physical properties of activated palm kernel shell for supercapacitor application, Key Eng.
Online since: July 2013
Authors: M. Mohapatra, B.S. Tomar
These glasses possess desirable properties like high chemical, mechanical, thermal and radiation stability for HLW storage.
Adawi, Effect of neutron and gamma irradiation on some properties of borate glasses, J.
Tsuboi, Optical properties of Ce3+/Tb3+-co-doped borosilicate glass, Eur.
Adawi, Effect of neutron and gamma irradiation on some properties of borate glasses, J.
Shelby, Effect of radiation on the physical properties of borosilicate glasses, J.
Adawi, Effect of neutron and gamma irradiation on some properties of borate glasses, J.
Tsuboi, Optical properties of Ce3+/Tb3+-co-doped borosilicate glass, Eur.
Adawi, Effect of neutron and gamma irradiation on some properties of borate glasses, J.
Shelby, Effect of radiation on the physical properties of borosilicate glasses, J.
Online since: October 2014
Authors: Ai He Wang, Liu Yang, Wei Zhang, Cai Wen Wang, Jun Zhou
Composting is the use of microbial action, the instability and degradation of organic matter into stable organic matter, and to reduce the volatile organic content, reduce odor; significantly improved physical properties (such as water content decreased, was loose, decentralized, granular), easy storage, transport and use; temperature compost heap can also kill the bacteria feed, eggs and seeds to make the product more suitable for the compost as a soil amendment and plant nutrient sources.
SF method i.e. sludge pyrolysis fuel oil low temperature [7], is a mixed sludge undigested after mechanical dewatering, the heavy oil was added to prepare a slurry fluidity of multi-effect evaporator, the organic fraction of the sludge in the heating heat cracking, mud-derived fuel production life.
JHTay et al [23] on the anaerobic sludge digestion and dewatering were studied adsorbents prepared by pyrolysis, and the physical and chemical properties of the adsorbent obtained was analyzed to give the adsorbent can reach the area SBET 647.4m2/g, the external surface area of 439.8 m2/g, pore area of 207.6m2/g.
The study also microwave pyrolysis furnace with a conventional heat treatment effects and properties of the solid carbon product is generated by a respective comparison.
Yanglijun [34], Yuan Chunyan [35] and others using sludge microwave pyrolysis method, respectively, phosphoric acid and activated carbon as microwave absorber studied factors microwave power, irradiation time, activated sludge adsorption agents, etc. affect agent performance.
SF method i.e. sludge pyrolysis fuel oil low temperature [7], is a mixed sludge undigested after mechanical dewatering, the heavy oil was added to prepare a slurry fluidity of multi-effect evaporator, the organic fraction of the sludge in the heating heat cracking, mud-derived fuel production life.
JHTay et al [23] on the anaerobic sludge digestion and dewatering were studied adsorbents prepared by pyrolysis, and the physical and chemical properties of the adsorbent obtained was analyzed to give the adsorbent can reach the area SBET 647.4m2/g, the external surface area of 439.8 m2/g, pore area of 207.6m2/g.
The study also microwave pyrolysis furnace with a conventional heat treatment effects and properties of the solid carbon product is generated by a respective comparison.
Yanglijun [34], Yuan Chunyan [35] and others using sludge microwave pyrolysis method, respectively, phosphoric acid and activated carbon as microwave absorber studied factors microwave power, irradiation time, activated sludge adsorption agents, etc. affect agent performance.
Nano-Structured Thin Films: A Lorentz Transmission Electron Microscopy and Electron Holography Study
Online since: January 2005
Authors: Jeff T.M. de Hosson, Hans A. De Raedt
In addition the material should have a reasonably high specific electrical resistivity
to reduce eddy currents, and also appropriate mechanical properties.
To obtain the desired properties (low coercivity, little strain and very small magnetostriction) the use materials with grain size of the order of 10 nm nanometers, like nano-crystalline iron based materials, becomes attractive.
Knowledge of local magnetic properties is essential for the development of new magnetic nanosized materials.
In this paper the possibility of a quantitative analysis of the magnetic properties of nanocrystalline iron using transmission electron microscopy is presented taking into account the thickness variation over the area of observation.
In particular the latter physical quantities affect the functional properties of ultra-soft magnetic materials for high-frequency inductors.
To obtain the desired properties (low coercivity, little strain and very small magnetostriction) the use materials with grain size of the order of 10 nm nanometers, like nano-crystalline iron based materials, becomes attractive.
Knowledge of local magnetic properties is essential for the development of new magnetic nanosized materials.
In this paper the possibility of a quantitative analysis of the magnetic properties of nanocrystalline iron using transmission electron microscopy is presented taking into account the thickness variation over the area of observation.
In particular the latter physical quantities affect the functional properties of ultra-soft magnetic materials for high-frequency inductors.
Online since: April 2019
Authors: Anis Aghbari, Hamza Ali Agha, D. Sadaoui, Smail Mouloud
A parametric study is achieved and obtained numerical results are presented using graphical illustrations, in order to ride how the governing parameters affects the flow field, temperature, concentration and solid volume fraction profiles.
This has aroused keen interest in understanding heat transfer mechanisms, which allows estimating and calculating the thermophysical properties of this innovative fluid.
Thus, several numerical and experimental studies dealing with the accurate assessment of nanofluid properties has been conducted [2-8].
The Boussinesq approximation is invoked for the fluid properties to relate the density changes to the temperature and the concentration, and to couple in this way the temperature and concentration fields to the flow field.
Miguel, Experimental Study on Nanofluid Flow in a Porous Cylinder: Viscosity, Permeability and Inertial Factor, Defect and Diffusion Forum, 362 (2015) 47-57
This has aroused keen interest in understanding heat transfer mechanisms, which allows estimating and calculating the thermophysical properties of this innovative fluid.
Thus, several numerical and experimental studies dealing with the accurate assessment of nanofluid properties has been conducted [2-8].
The Boussinesq approximation is invoked for the fluid properties to relate the density changes to the temperature and the concentration, and to couple in this way the temperature and concentration fields to the flow field.
Miguel, Experimental Study on Nanofluid Flow in a Porous Cylinder: Viscosity, Permeability and Inertial Factor, Defect and Diffusion Forum, 362 (2015) 47-57