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Online since: July 2014
Authors: Artem Frolov, Ludmila Chumadova, Artemiy Cherkashin, Luka Akimov
Despite of the huge number of advantages of nanomodified concrete, analysis of the use of nanoparticles shows that they are used quite seldom, as it requires a large cash outlay.
Nanomodified reinforced concrete out-performs an ordinary reinforced concrete in many features, such as: 1) Reduction of own weight of the structure due to low density of nanomodified cocncrete. 2) Modification of the reinforcement system and reduction of amount of reinforcement used in concrete. 3) Reduction of footing loads of the structure, so foundation design is simplified and quantity of earthworks is reduced. 4) Exclusion of general and special damp course from the structure. 5) Price reduction and acceleration of en bloc reinforced concrete building construction. 6) Increase of safety and reliability of antiseismic construction. 7) Reduction of number of aseismic isolation elements in building construction in areas with high earthquake activity. 8) Increase of fire-resistance of buildings and structures [1].
It significantly reduce the number of interstices bigger than 1nm.
In the article [33] we considered a successful modification of French giperplasticizer PREMIA 360 with astralenes and an injection into the fine-grained concrete mixtures of oil shale ash ZolestBET [34].
Ponomarev, A.N., Egorushkin, V.E., Melnikova, N.V., , Reshetnyak, A.A.Anomalous thermal conductivity in multiwalled carbon nanotubes with impurities and short-range order (2010) Journal of Physics: Conference Series (International Conference on Theoretical Physics Dubna-Nano 2010; Dubna; Russian Federation; 5 July 2010 through 10 July 2010; Code 83234) Vol. 248, Article number 012005
Nanomodified reinforced concrete out-performs an ordinary reinforced concrete in many features, such as: 1) Reduction of own weight of the structure due to low density of nanomodified cocncrete. 2) Modification of the reinforcement system and reduction of amount of reinforcement used in concrete. 3) Reduction of footing loads of the structure, so foundation design is simplified and quantity of earthworks is reduced. 4) Exclusion of general and special damp course from the structure. 5) Price reduction and acceleration of en bloc reinforced concrete building construction. 6) Increase of safety and reliability of antiseismic construction. 7) Reduction of number of aseismic isolation elements in building construction in areas with high earthquake activity. 8) Increase of fire-resistance of buildings and structures [1].
It significantly reduce the number of interstices bigger than 1nm.
In the article [33] we considered a successful modification of French giperplasticizer PREMIA 360 with astralenes and an injection into the fine-grained concrete mixtures of oil shale ash ZolestBET [34].
Ponomarev, A.N., Egorushkin, V.E., Melnikova, N.V., , Reshetnyak, A.A.Anomalous thermal conductivity in multiwalled carbon nanotubes with impurities and short-range order (2010) Journal of Physics: Conference Series (International Conference on Theoretical Physics Dubna-Nano 2010; Dubna; Russian Federation; 5 July 2010 through 10 July 2010; Code 83234) Vol. 248, Article number 012005
Online since: December 2012
Authors: Ramesh Chandra Agarwala, Vijaya Agarwala, Preeti Makkar
It was observed that the film having lower phosphorous concentration adheres well at the surface while the higher phosphorous concentration film has fallen off at number of places and the substrate has been exposed.
In the Ni-P alloy compositions [Table 2], the alloys containing low P content are characterized by crystalline and microcrystalline nickel which indicates that the number of phosphorous atoms are not sufficient to distort the nickel lattice to an extent where amorphous nickel can be obtained, rarely observed regions of amorphous nickel even in 10.8 at.
Apart from Ni, a number of non-equilibrium phases with a general chemical formula NixPy are also there in as deposited films and the Ni content in it increases with increase in P content of the film.
Also, the crystalline nature is less prominent in Ni-P-X satisfies the result of SEM analysis and the grain size reduction by the presence of broaden peak.
The enhancement in grain size within the particles of annealed EL (Ni-P)/RAM powder is due to simultaneous growth of EL Ni-P and RAM powders [28].
In the Ni-P alloy compositions [Table 2], the alloys containing low P content are characterized by crystalline and microcrystalline nickel which indicates that the number of phosphorous atoms are not sufficient to distort the nickel lattice to an extent where amorphous nickel can be obtained, rarely observed regions of amorphous nickel even in 10.8 at.
Apart from Ni, a number of non-equilibrium phases with a general chemical formula NixPy are also there in as deposited films and the Ni content in it increases with increase in P content of the film.
Also, the crystalline nature is less prominent in Ni-P-X satisfies the result of SEM analysis and the grain size reduction by the presence of broaden peak.
The enhancement in grain size within the particles of annealed EL (Ni-P)/RAM powder is due to simultaneous growth of EL Ni-P and RAM powders [28].
Online since: April 2024
Authors: Mohammed Abdulkareem Adisa, Ahmed Olatunbosun Omoniyi, Mutiu Adelodun Akinpelu, Rasheed Abdulwahab, Samson Olalekan Odeyemi
Table 2 also shows the number of experimental runs, and the weights of GCHA, RHA, and cement used for each run at a constant water-binder ratio of 0.5.
These tests were conducted at the ROLAB research and diagnostic laboratory in Oyo State, adhering to ASTM E1621 [36] and ASTM E1382 [37] standards. 2.2.2.2 Mechanical Properties of Concrete Containing GHCA and RHA The compressive strength test which conformed with the stipulations in BS EN 12390-3:2019 [38] was conducted using a STYE-2000 Analogue type compression testing machine with serial number 131010 supplied by Okhard Machine Tools, Lagos, Nigeria.
The grant’s reference number is KWASUIBR/CRIT/270921/VOL1/TETF2020/0015.
[35] ASTM D7928, “ASTM D7928-17 Standard Test Method for Particle-Size Distribution (Gradation) of Fine-Grained Soils Using the Sedimentation (Hydrometer) Analysis,” (2017)
[37] ASTM E1382-97, “Standard Test Methods for Determining Average Grain Size Using Semiautomatic and Automatic Image Analysis,” (2015)
These tests were conducted at the ROLAB research and diagnostic laboratory in Oyo State, adhering to ASTM E1621 [36] and ASTM E1382 [37] standards. 2.2.2.2 Mechanical Properties of Concrete Containing GHCA and RHA The compressive strength test which conformed with the stipulations in BS EN 12390-3:2019 [38] was conducted using a STYE-2000 Analogue type compression testing machine with serial number 131010 supplied by Okhard Machine Tools, Lagos, Nigeria.
The grant’s reference number is KWASUIBR/CRIT/270921/VOL1/TETF2020/0015.
[35] ASTM D7928, “ASTM D7928-17 Standard Test Method for Particle-Size Distribution (Gradation) of Fine-Grained Soils Using the Sedimentation (Hydrometer) Analysis,” (2017)
[37] ASTM E1382-97, “Standard Test Methods for Determining Average Grain Size Using Semiautomatic and Automatic Image Analysis,” (2015)
Online since: June 2021
Authors: Md Tanwir Alam
The corrosion resistance get reduced with the incorporation of SiC due to the increase in porosity and number of nucleation sites.
This cycle is repeated for a number of times based on the real-time conditions [10-15].
The results of laboratory immersion corrosion testing for metals, alloys or composites mainly weight loss method depends on the various factors such as apparatus used, number of specimens, materials of the specimen, test conditions (composition of solution, temperature of solution, degasification, solution state (stable/motion), volume of solution, method of supporting test specimens, immersion time), methods of cleaning specimens, interpretation of results, moisture, temperature, air pollution, water quality, acids/bases/salts, concentration difference across metal surface, contact between dissimilar metals and calculation of corrosion rates [16-21].
As a result of this, the numbers of sites are increased which are available for the corrosion to occur [10, 35].
[22] Roland Tolulope Loto and Phillip Babalola, Analysis of SiC grain size variation and NaCl concentration on the corrosion susceptibility of AA1070 aluminium matrix composites, Cogent Engineering. 2018; 5: 1473002. https://doi.org/10.1080/23311916.2018.1473002 [23] M.
This cycle is repeated for a number of times based on the real-time conditions [10-15].
The results of laboratory immersion corrosion testing for metals, alloys or composites mainly weight loss method depends on the various factors such as apparatus used, number of specimens, materials of the specimen, test conditions (composition of solution, temperature of solution, degasification, solution state (stable/motion), volume of solution, method of supporting test specimens, immersion time), methods of cleaning specimens, interpretation of results, moisture, temperature, air pollution, water quality, acids/bases/salts, concentration difference across metal surface, contact between dissimilar metals and calculation of corrosion rates [16-21].
As a result of this, the numbers of sites are increased which are available for the corrosion to occur [10, 35].
[22] Roland Tolulope Loto and Phillip Babalola, Analysis of SiC grain size variation and NaCl concentration on the corrosion susceptibility of AA1070 aluminium matrix composites, Cogent Engineering. 2018; 5: 1473002. https://doi.org/10.1080/23311916.2018.1473002 [23] M.
Online since: October 2013
Authors: Shi Yan, Fu Gang Wang, Yan Lin Yang, Gua Hong Feng
A number of numerical simulations under various geological and pressure/temperature conditions are performed.
The basic simulation parameters Simulation parameters value Hydrogeological and thermal parameters Thickness, H Rock grain density, ρ Rock specific heat, c Rock thermal conductivity, λ Porosity of meandering river sedimentary facies , ф1 Permeability of meandering river sedimentary facies , k1 Porosity of delta sedimentary facies, ф2 Permeability of delta sedimentary facies , k2 Ratio of vertical to horizontal Permeability Initial condition Water saturation in base case, Sl Gas saturation in CO2-only case, Sg Temperature, Tin Pressure, Pin Production/injection Injector–producer distance, L Injection temperature, Tinj Injection pressure, Pinj Production pressure, PPro 100 m 2600 kg/m3 1000 J/kg·℃ 2.51 W/m·℃ 0.143 8.72×10-15 m2 0.125 3.41×10-15 m2 0.1 1.0 1.0 120 ℃ 25.0×106 Pa 707m 20℃ Pin + 10 bar PPro - 10 bar In the Songliao basin, the geothermal gradient is high, geothermal flow is abundant.
The program can deal with one-, two-, or three-dimensional porous and fractured media with physical and chemical heterogeneity and any number of chemical species present in liquid, gas, and solid phases.
The program has been applied for a large number of EGS and CCS projects, such as the United States Nevada state Desert Peak EGS project, France Solutz EGS site, Japan's Ogachi EGS project, the United States Frio CO2 geological sequestration, and Australia Otway CO2 geological sequestration.
So there are 137 grids of Tyson polygon in each layer, the total number of grids amount to 2740.
The basic simulation parameters Simulation parameters value Hydrogeological and thermal parameters Thickness, H Rock grain density, ρ Rock specific heat, c Rock thermal conductivity, λ Porosity of meandering river sedimentary facies , ф1 Permeability of meandering river sedimentary facies , k1 Porosity of delta sedimentary facies, ф2 Permeability of delta sedimentary facies , k2 Ratio of vertical to horizontal Permeability Initial condition Water saturation in base case, Sl Gas saturation in CO2-only case, Sg Temperature, Tin Pressure, Pin Production/injection Injector–producer distance, L Injection temperature, Tinj Injection pressure, Pinj Production pressure, PPro 100 m 2600 kg/m3 1000 J/kg·℃ 2.51 W/m·℃ 0.143 8.72×10-15 m2 0.125 3.41×10-15 m2 0.1 1.0 1.0 120 ℃ 25.0×106 Pa 707m 20℃ Pin + 10 bar PPro - 10 bar In the Songliao basin, the geothermal gradient is high, geothermal flow is abundant.
The program can deal with one-, two-, or three-dimensional porous and fractured media with physical and chemical heterogeneity and any number of chemical species present in liquid, gas, and solid phases.
The program has been applied for a large number of EGS and CCS projects, such as the United States Nevada state Desert Peak EGS project, France Solutz EGS site, Japan's Ogachi EGS project, the United States Frio CO2 geological sequestration, and Australia Otway CO2 geological sequestration.
So there are 137 grids of Tyson polygon in each layer, the total number of grids amount to 2740.
Online since: June 2013
Authors: Hedi Belhadj Salah, Henia Arfa, Riadh Bahloul
Previous work was not accomplished with the help of design of experiments (DOE), thus reducing the number of parameters varied at any time.
Using this forming strategy it is obvious that there are a relatively large number of adjustable process parameters that can influence the forming process for a given geometry such as the forming angle, the radius of the forming tool, the initial thickness of the sheet metal or the size of the step down.
The Box-Behnken design can analyse four factors in three levels in a total number of 27 numerical simulation runs performed.
In presence of a significant number of factors, the construction of the Pareto chart can offer an interesting alternative to the main effects of forming parameters and their interactions.
Richard, Influence of the initial grain size in single point incremental forming process for thin sheets metal and microparts: Experimental investigations, J.
Using this forming strategy it is obvious that there are a relatively large number of adjustable process parameters that can influence the forming process for a given geometry such as the forming angle, the radius of the forming tool, the initial thickness of the sheet metal or the size of the step down.
The Box-Behnken design can analyse four factors in three levels in a total number of 27 numerical simulation runs performed.
In presence of a significant number of factors, the construction of the Pareto chart can offer an interesting alternative to the main effects of forming parameters and their interactions.
Richard, Influence of the initial grain size in single point incremental forming process for thin sheets metal and microparts: Experimental investigations, J.
Online since: October 2014
Authors: Susan Trolier-McKinstry, Paul M. Solomon, Glenn J. Martyna, Bruce G. Elmegreen, Matt Copel, Marcelo A. Kuroda, Thomas M. Shaw, Alejandro G. Schrott, Xiao Hu Liu, Dennis M. Newns
A macroscopic-scale PET has been built to demonstrate PET viability over large numbers of switching cycles.
One example of an alternative device is the electromechanical relay [6-8], but this is a relatively slow switch with a number of cycles limited by damage from making/breaking contacts.
We observe that the thinner films have smaller crystallite grain size so perhaps a further increase in temperature will especially improve the response of the thinner films.
An odd number of inverters connected in series into a closed loop forms a ring oscillator.
Acknowledgements: This research was partially supported by the DARPA MESO Program (Mesodynamic Architectures) under contract number N66001–11-C-4109.
One example of an alternative device is the electromechanical relay [6-8], but this is a relatively slow switch with a number of cycles limited by damage from making/breaking contacts.
We observe that the thinner films have smaller crystallite grain size so perhaps a further increase in temperature will especially improve the response of the thinner films.
An odd number of inverters connected in series into a closed loop forms a ring oscillator.
Acknowledgements: This research was partially supported by the DARPA MESO Program (Mesodynamic Architectures) under contract number N66001–11-C-4109.
Online since: October 2006
Authors: Abdul Ghani Olabi, E.M. Anawa
It is evident that Taguchi approach has decreased the number of experiments without
negative effects on the result.
Joining ferritic low carbon steel is faced with the problem of coarse grains in the weld zone and heat affected zone of fusion welds and consequent low toughness and ductility due to the absence of phase transformation [2].
Joining ferritic low carbon steel is faced with the problem of coarse grains in the weld zone and heat affected zone of fusion welds and consequent low toughness and ductility due to the absence of phase transformation [2].
Online since: October 2012
Authors: Qi Rui Wang, Jun Gao
Spatiotemporal Variability of Soil Moisture under Different
Agroforestry Landscape in Jinghe River
Wang Qirui1 Gao Jun2
(1 Henan Academy of Forestry,zhengzhou450008,china; 2.Research Institute of Forestry, CAF,Beijing10009 ,china)
Keywords:Jinghe River;soil water;spatiotemporal variability
Abstract:Measured the cover soil water content in soil layer 0~30cm of different agroforestry landscape types in Jinghe river with TDR, the landscape types including sloping cropland, apple orchard, apple-clover system, land under forest and grass changed from grain crop and black locust forest.
The natural vegetation is destroyed, cultivate breed index is high, land use types to slope farmland, orchard, Guo Mu, retreat return n cultivated land forest land and forest land compound mainly. 2 Materials and methods Selection includes different agricultural landscape slope from top to the bottom of the slope, agroforestry models were: Wheat ( start test have been harvested ), apple orchards, apple - alfalfa intercropping, retreat return n cultivated land forest and Robinia pseudoacacia Plantation ( see Figure 1, figure number length ).
The natural vegetation is destroyed, cultivate breed index is high, land use types to slope farmland, orchard, Guo Mu, retreat return n cultivated land forest land and forest land compound mainly. 2 Materials and methods Selection includes different agricultural landscape slope from top to the bottom of the slope, agroforestry models were: Wheat ( start test have been harvested ), apple orchards, apple - alfalfa intercropping, retreat return n cultivated land forest and Robinia pseudoacacia Plantation ( see Figure 1, figure number length ).
Online since: June 2013
Authors: Claudio Giardini, Luca Giorleo, Elisabetta Ceretti
The main advantage of workpieces produced by ring rolling, compared to other technological processes, is given by the size and orientation of grains, especially on the worked surface which give to the final product excellent mechanical properties.
Moreover, due to the nature of the process, it is possible to reduce the number of elements, and so the computational time, by considering a symmetric model.
Moreover, due to the nature of the process, it is possible to reduce the number of elements, and so the computational time, by considering a symmetric model.