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Online since: December 2013
Authors: Sergei Yu. Tarasov, Alexandr Melnikov, Dmitry V. Lychagin, Andrey V. Chumaevsky
Introduction
Low temperature surface modification by mechanical processing such as burnishing or friction stir processing becomes to be widely used for many metallic materials now.
It is reasonable to reduce the energy input into the process since it may affect the final structure of the processed metal or weld.
The distribution of slip bands (SB) on these faces is governed by the Schmid factor values for the slip systems and loading forces which include both compression and friction forces.
Rigney, The effects of sliding velocity and sliding time on nanocrystalline tribolayer development and properties in copper, Wear 267 (2009) 562–567
It is reasonable to reduce the energy input into the process since it may affect the final structure of the processed metal or weld.
The distribution of slip bands (SB) on these faces is governed by the Schmid factor values for the slip systems and loading forces which include both compression and friction forces.
Rigney, The effects of sliding velocity and sliding time on nanocrystalline tribolayer development and properties in copper, Wear 267 (2009) 562–567
Online since: July 2020
Authors: Sukarni Sukarni, Lukman Arifianto Andi Saputra
Alternative energy from SW must be clearly evaluated in relation to the chemical properties.
This property is one of the main parameters for a source of fuel because this property will affect fuel behavior in the combustion chamber.
Material and Method Material and Physicochemical Properties.
Table 1 Physicochemical properties of several Synthetic Waste Unit MSW hydrothermally treated [7] MSW dried 105oC [8] Combustible MSW [2] Chemical Properties C % 45.2 5.45 7.47 H % 6.3 6.86 - O % 24.8 30.64 14.64 N % 0.9 1.36 - S % - 2.49 - Al % - - 8.91 Na % - - 0.64 Ca % - - 0.45 Physical Properties M % 11.6 2.25 VM % 70.9 57.00 65.45 FC % 6.3 12.29 28.94 Ash % 22.8 3.81 3.36 HHV MJ/kg 17.8 6.72 33.87 Thermal Analysis Method.
Wardana, Potential and properties of marine microalgae Nannochloropsis oculata as biomass fuel feedstock, Int.
This property is one of the main parameters for a source of fuel because this property will affect fuel behavior in the combustion chamber.
Material and Method Material and Physicochemical Properties.
Table 1 Physicochemical properties of several Synthetic Waste Unit MSW hydrothermally treated [7] MSW dried 105oC [8] Combustible MSW [2] Chemical Properties C % 45.2 5.45 7.47 H % 6.3 6.86 - O % 24.8 30.64 14.64 N % 0.9 1.36 - S % - 2.49 - Al % - - 8.91 Na % - - 0.64 Ca % - - 0.45 Physical Properties M % 11.6 2.25 VM % 70.9 57.00 65.45 FC % 6.3 12.29 28.94 Ash % 22.8 3.81 3.36 HHV MJ/kg 17.8 6.72 33.87 Thermal Analysis Method.
Wardana, Potential and properties of marine microalgae Nannochloropsis oculata as biomass fuel feedstock, Int.
Online since: February 2006
Authors: Nadimul Haque Faisal, Rehan Ahmed, G. Heaton, Bryan Allcock, R.L. Reuben, John A. Steel
.,
1
Heaton, G. and
2
Allcock, B.
1
Mechanical Engineering, School of Engineering and Physical Sciences, Heriot-Watt University,
Edinburgh, EH14 4AS, UK
2
Monitor Coatings Ltd, Monitor House, 2 Elm Road, West Chirton Industrial Estate North,
Tyne & Wear, NE29 8SE, UK
N.H.Faisal@hw.ac.uk, J.A.Steel@hw.ac.uk, R.Ahmed@hw.ac.uk, R.L.Reuben@hw.ac.uk,
G.Heaton@hw.ac.uk, BryanAllcock@monitorcoatings.co.uk
Keywords: Acoustic emission; Thermal spray; HVOF; Non-destructive testing; Monitoring
Abstract.
Process parameters such as gun speed, oxy-fuel pressure and powder specification affect various characteristics of the coating, including thermal residual stresses; the lamellar microstructure and the topology and geometry of pores, all formed when the fused powder hits the surface, forming "splats".
AE parameters can be successfully correlated with HVOF spray process parameters and coating properties then it may be possible to use AE as a process control parameter to improve cohesive and adhesive strength, hardness, porosity and tribo-mechanical properties of thermal spray coatings using this technique.
Varying the gun transverse speed should alter the sprayed particle flux per unit area landing on the substrate, a factor which is known to affect the strength of the coating layer (Nishinoiri et al., 2003).
Process parameters such as gun speed, oxy-fuel pressure and powder specification affect various characteristics of the coating, including thermal residual stresses; the lamellar microstructure and the topology and geometry of pores, all formed when the fused powder hits the surface, forming "splats".
AE parameters can be successfully correlated with HVOF spray process parameters and coating properties then it may be possible to use AE as a process control parameter to improve cohesive and adhesive strength, hardness, porosity and tribo-mechanical properties of thermal spray coatings using this technique.
Varying the gun transverse speed should alter the sprayed particle flux per unit area landing on the substrate, a factor which is known to affect the strength of the coating layer (Nishinoiri et al., 2003).
Online since: July 2013
Authors: Biswajit Basu, Ricardo Simon Carbajo, Esther Simon Carbajo, Ciaran McGoldrick
Dynamic systems, that exhibit changes in properties such as mass, damping or stiffness, are of particular interest and industrial significance.
Sub second execution durations demonstrate the efficacy of the approach for continuous detection of change in sensed structural properties.
Once the algorithm is trained and calibrated, short and long term variations in the properties of the structure are detected progressively over time.
The lag, or delay, in reliably determining a change in the monitored system property can be affected by the resource availability of the processing node.
Mechanical Systems and Signal Processing 28 (2012) 212-228
Sub second execution durations demonstrate the efficacy of the approach for continuous detection of change in sensed structural properties.
Once the algorithm is trained and calibrated, short and long term variations in the properties of the structure are detected progressively over time.
The lag, or delay, in reliably determining a change in the monitored system property can be affected by the resource availability of the processing node.
Mechanical Systems and Signal Processing 28 (2012) 212-228
Online since: March 2015
Authors: Magdalena Popczyk, A. Budniok, Patrycja Osak, B. Łosiewicz, Agnieszka Smołka, Magdalena Szklarska
It is a so-called 'barometer' of the optical, electrical and mechanical properties of the sample [1-15].
For selection of the type of the insulating material, its appropriate properties as hydrophobicity, chemical stability and resistance to penetration of ions should be taken into account.
The main factors that influence the crack initiation and propagation in these high-strength aluminum alloys are searched for.
Study on electrochemical and initial corrosion behavior of ultrahigh strength steel Ultrahigh strength (UHS) steels are used in industry as structural materials due to their excellent mechanical properties such as fracture toughness.
The authors proved that the anodic partial reaction of the corrosion process is affected preferentially by the oxide products.
For selection of the type of the insulating material, its appropriate properties as hydrophobicity, chemical stability and resistance to penetration of ions should be taken into account.
The main factors that influence the crack initiation and propagation in these high-strength aluminum alloys are searched for.
Study on electrochemical and initial corrosion behavior of ultrahigh strength steel Ultrahigh strength (UHS) steels are used in industry as structural materials due to their excellent mechanical properties such as fracture toughness.
The authors proved that the anodic partial reaction of the corrosion process is affected preferentially by the oxide products.
Online since: October 2015
Authors: Jiří Štoller, Marek Foglar, Eva Zezulová
Possibility of repeating the tests is important especially for the study of changes in physic-mechanical properties of construction materials.
The ultrasonic pulse method was chosen for determining the quality of the testing material and changes of its properties that occurs after loading the sample by explosion of plastic explosives.
The propagation of ultrasound waves is a function of the properties of the tested material (air 330 m.s-1, water 1500 m.s-1, steel 5000–6000 m.s-1, concrete 3000–5000 m.s-1).
The disadvantages include the difficulty in interpreting the results in more complex cases, and the sensitivity of the ultrasound method to the whole range of external factors.
This fact – while being reinforced by certain minimal amount of fibres – is a ground for important change of properties that have been marked as basic drawbacks of conventional concrete.
The ultrasonic pulse method was chosen for determining the quality of the testing material and changes of its properties that occurs after loading the sample by explosion of plastic explosives.
The propagation of ultrasound waves is a function of the properties of the tested material (air 330 m.s-1, water 1500 m.s-1, steel 5000–6000 m.s-1, concrete 3000–5000 m.s-1).
The disadvantages include the difficulty in interpreting the results in more complex cases, and the sensitivity of the ultrasound method to the whole range of external factors.
This fact – while being reinforced by certain minimal amount of fibres – is a ground for important change of properties that have been marked as basic drawbacks of conventional concrete.
Online since: June 2021
Authors: Ling Fang Ruan, Shao Ming Ying, Jia Wei Wang
Therefore, choosing a kind of anode materials with excellent lithium storage performance and being environmentally friendly is one of the key factors determining the performance of lithium-ion batteries.
Although the SEI layer is critical for stabilizing the cycling of silicon-based anodes due to its passivation properties, it also consumes recyclable lithium and electrolyte during its formation, resulting in capacity degradation.
Two dimensional Si nanosheets have excellent electrochemical properties due to the shorter path length and more lithium ion diffusion/insertion channels.
Therefore, the preparation of SiOx composite materials by doping and coating is also a major trend in current research. (3) Most of the silicon-based anode materials are coated with carbon materials on the surface, using the excellent electrical conductivity and elastic properties of the carbon materials to prevent the surface of the material from cracks.
Chemical and mechanical degradation and mitigation strategies for Si anodes, J.
Although the SEI layer is critical for stabilizing the cycling of silicon-based anodes due to its passivation properties, it also consumes recyclable lithium and electrolyte during its formation, resulting in capacity degradation.
Two dimensional Si nanosheets have excellent electrochemical properties due to the shorter path length and more lithium ion diffusion/insertion channels.
Therefore, the preparation of SiOx composite materials by doping and coating is also a major trend in current research. (3) Most of the silicon-based anode materials are coated with carbon materials on the surface, using the excellent electrical conductivity and elastic properties of the carbon materials to prevent the surface of the material from cracks.
Chemical and mechanical degradation and mitigation strategies for Si anodes, J.
Online since: March 2025
Authors: Ahmad Fauzi Ismail, Farhana Aziz, Mohd Hafiz Dzarfan Othman, Juhana Jaafar, Fahad Mir, Azmat Ali Khan, Mustafa Kamal, Zeeshan Khan, Mukhlis Abdul Rahman
Fig. 3 SEM image of MXene/TiO2 composite photocatalyst
MXene’s Structure and Properties, as a Potential Photoactive Co-catalyst Material.
The size and properties of the membrane pores play a significant role in the removal efficiency of the photocatalytic membrane.
The adsorption capacity of the photocatalytic membrane is influenced by several factors, including the type of membrane material, surface charge, and pore size distribution.
These factors collectively contribute to the improved separation of charge carriers and enhanced adsorption of dye molecules.
Falath, Nanomaterials: A review of synthesis methods, properties, recent progress, and challenges.
The size and properties of the membrane pores play a significant role in the removal efficiency of the photocatalytic membrane.
The adsorption capacity of the photocatalytic membrane is influenced by several factors, including the type of membrane material, surface charge, and pore size distribution.
These factors collectively contribute to the improved separation of charge carriers and enhanced adsorption of dye molecules.
Falath, Nanomaterials: A review of synthesis methods, properties, recent progress, and challenges.
Online since: January 2012
Authors: Gui Lin Zheng, Zhi Fu Zhang
In order to guarantee the magnetic latching relay shut off at current zero-crossing point accurately in long term operation, a dynamic compensation for delay time is proposed based on all-around research of the properties of magnetic latching relay actuation time.
If the mechanical contact can shut off at the point of the current zero-crossing , and in an instant the contact draw back enough distance which can make sure that it can endure the recovery voltage without breakdown, there will be no arc between the contact gaps.
Block diagram of current zero-crossing break In summary, the actuation time of magnetic latching relay is a key factor which determines whether A phase can be shut off at the point of current zero-crossing.
Such sample data must be removed, otherwise it will seriously affect the estimation of delay time Td.
Furthermore, there is still a high interest in researching new solutions based on the mentioned properties of CAN [8].
If the mechanical contact can shut off at the point of the current zero-crossing , and in an instant the contact draw back enough distance which can make sure that it can endure the recovery voltage without breakdown, there will be no arc between the contact gaps.
Block diagram of current zero-crossing break In summary, the actuation time of magnetic latching relay is a key factor which determines whether A phase can be shut off at the point of current zero-crossing.
Such sample data must be removed, otherwise it will seriously affect the estimation of delay time Td.
Furthermore, there is still a high interest in researching new solutions based on the mentioned properties of CAN [8].
Online since: November 2021
Authors: M.N. Bouaziz, A. Aziz, Amina Manel Bouaziz
Experimental works were conducted generally to determine accurately the properties of the nanofluids.
Mahanthesh et.al [2, 3] used a traditional model, where the properties of the nanofluids are directly included.
In relation with Fig. 6 – 7, the temperature profiles are not affected strongly by the nanoparticle condition considering same values of the dispersions.
Das; A review and analysis on influence of temperature and concentration of nanofluids on thermophysical properties, heat transfer and pumping power, International journal of heat and mass transfer 55 15-16 (2012) 4063-4078
S. kumar; Mechanisms proposed through experimental investigations on thermophysical properties and forced convective heat transfer characteristics of various nanofluids – A review, Renewable and Sustainable Energy Reviews 16 (2012) 3917-3938
Mahanthesh et.al [2, 3] used a traditional model, where the properties of the nanofluids are directly included.
In relation with Fig. 6 – 7, the temperature profiles are not affected strongly by the nanoparticle condition considering same values of the dispersions.
Das; A review and analysis on influence of temperature and concentration of nanofluids on thermophysical properties, heat transfer and pumping power, International journal of heat and mass transfer 55 15-16 (2012) 4063-4078
S. kumar; Mechanisms proposed through experimental investigations on thermophysical properties and forced convective heat transfer characteristics of various nanofluids – A review, Renewable and Sustainable Energy Reviews 16 (2012) 3917-3938