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Online since: October 2020
Authors: Nathan Christopher Kruppe, Tobias Brögelmann, Kirsten Bobzin, Julia Janowitz
This multilayer sensor coating was deposited using an industrial coating unit and was tested with regard to the sensor properties.
The insulating protective top layer was deposited without bond coat to ensure the insulation properties to the sensor layers Ni and NiCr.
Fig. 1: Schematic procedure of the sensor coating deposition using masking Morphologie and coating properties.
Experimental Results Morphologie and coating properties.
To prove the sensor properties, the sensor coating showed in both measuring modes reproducible results.
The insulating protective top layer was deposited without bond coat to ensure the insulation properties to the sensor layers Ni and NiCr.
Fig. 1: Schematic procedure of the sensor coating deposition using masking Morphologie and coating properties.
Experimental Results Morphologie and coating properties.
To prove the sensor properties, the sensor coating showed in both measuring modes reproducible results.
Online since: September 2013
Authors: Henry Pan, Chuan Hai Jiang, Ke Zhan
Introduction
S30432 austenitic stainless steel, developed on the basis of TP304H austenitic steel, is extensively used as the super-heater tubes in critical and super critical power plants, due to its superior mechanical properties at elevated temperature [1].
It is therefore of interest to apply a mechanical surface treatment to enhance their oxidization resistance.
Shot peening is a widely used surface treatment, which could improve the surface-related properties such as fatigue, stress corrosion, due to the compressive residual stress and refined microstructure in near surface layer after shot peening [4, 5].
And the mechanical relaxation of the shot peened S30432 steel has been discussed in details.
It reveals that the annealing temperature is a critical factor for micro-strain relaxation.
It is therefore of interest to apply a mechanical surface treatment to enhance their oxidization resistance.
Shot peening is a widely used surface treatment, which could improve the surface-related properties such as fatigue, stress corrosion, due to the compressive residual stress and refined microstructure in near surface layer after shot peening [4, 5].
And the mechanical relaxation of the shot peened S30432 steel has been discussed in details.
It reveals that the annealing temperature is a critical factor for micro-strain relaxation.
Online since: June 2017
Authors: Xin Ying Teng, Xing Jing Ge, Shu Min Xu, Jin Yang Zhang
Introduction
As one of the lightest structural materials, magnesium alloy is considered one of the most promising structural materials and received widespread attention all over the world with its abundant resources, superior mechanical and casting properties, and excellent cost-effective.
However, there are many processing parameters that can influence the distance, such as wheel speed, gas ejection pressure, and melting temperature.[7,8] When both of the gas ejection pressure and melting temperature are stable, the quantity and thermal physical properties of the melt are constant.
The quasicrystal formation depends on two factors including the cooling rate and alloy composition.
The cooling rate directly affects the quasicrystal nucleation and growth process.
Zhang: Microstructure and properties of rapidly solidified Mg-Zn-Y-Zr alloy ribbons.
However, there are many processing parameters that can influence the distance, such as wheel speed, gas ejection pressure, and melting temperature.[7,8] When both of the gas ejection pressure and melting temperature are stable, the quantity and thermal physical properties of the melt are constant.
The quasicrystal formation depends on two factors including the cooling rate and alloy composition.
The cooling rate directly affects the quasicrystal nucleation and growth process.
Zhang: Microstructure and properties of rapidly solidified Mg-Zn-Y-Zr alloy ribbons.
Online since: March 2008
Authors: Julia M. Polak, Larry L. Hench
A critical increase in cell mass is
required and synthesis and activation of various growth factors is necessary for the G2-M transition.
Activation of several immediate early response genes and synthesis of growth factors is likely to modulate the cell cycle response of osteoblasts to Bioglass.
The transcription factors that were activated include c-jun, fra-1 and c-myc, three well characterised osteoblast transcription factors.
Thus, osteocytes represent the cell population responsible for extracellular matrix production and mineralisation, the final step in bone development and probably the most crucial one given the importance of collagen-hydroxyl carbonate apatite (HCA) bonding in determining the biomechanical properties of bone.
Hench,'Factors Affecting the Structure and Properties of Bioactive Foam Scaffolds for Tissue Engineering', Journal of Biomedical Materials Research Part B-Applied Biomaterials, 68B (2004), 36-44. 64.
Activation of several immediate early response genes and synthesis of growth factors is likely to modulate the cell cycle response of osteoblasts to Bioglass.
The transcription factors that were activated include c-jun, fra-1 and c-myc, three well characterised osteoblast transcription factors.
Thus, osteocytes represent the cell population responsible for extracellular matrix production and mineralisation, the final step in bone development and probably the most crucial one given the importance of collagen-hydroxyl carbonate apatite (HCA) bonding in determining the biomechanical properties of bone.
Hench,'Factors Affecting the Structure and Properties of Bioactive Foam Scaffolds for Tissue Engineering', Journal of Biomedical Materials Research Part B-Applied Biomaterials, 68B (2004), 36-44. 64.
Online since: June 2014
Authors: Mihai Berteanu, Ileana Ciobanu, Alina Nela Iliescu, Petre Lucian Seiciu, Ruxandra Ileana Badea, Andreea Georgiana Marin
The objectives of the physical therapy intervention program must be tailored according to the degree of disability presented by the patient, to the range of the impairments affecting gait and converging to the disability, to his/her physical and psychological resources, as well as to the individual consideration for a good quality of life.
Gait is disturbed, impaired and even impossible in some medical conditions, and the contextual personal and environmental factors may improve or may worsen the walking ability of the person /13/.
Arch Phys Med Rehabil. 1978 Mar;59(3):124-33, [6] Marie-Louise Bird et al.: Age-Related Changes in Physical Fall Risk Factors: Results from a 3 Year Follow-up of Community Dwelling Older Adults in Tasmania, Australia.
[19] Lord S. et al.: Gait variability in older adults: a structured review of testing protocol and clinimetric properties.
Pages:434-437 [23] Chutima Jalayondeja et al: Factors related to community participation by stroke victims six month post-stroke.
Gait is disturbed, impaired and even impossible in some medical conditions, and the contextual personal and environmental factors may improve or may worsen the walking ability of the person /13/.
Arch Phys Med Rehabil. 1978 Mar;59(3):124-33, [6] Marie-Louise Bird et al.: Age-Related Changes in Physical Fall Risk Factors: Results from a 3 Year Follow-up of Community Dwelling Older Adults in Tasmania, Australia.
[19] Lord S. et al.: Gait variability in older adults: a structured review of testing protocol and clinimetric properties.
Pages:434-437 [23] Chutima Jalayondeja et al: Factors related to community participation by stroke victims six month post-stroke.
Online since: February 2018
Authors: X.D. Wang, Y.G. Wang, W.L. Ge
Therefore,the cutting forces stability was an important factor that influence the hole quality.
In recent years, aluminum alloys is considered to be one of the most promising material and have an increasing demand in the automotive and aerospace industries due to its unique physical and mechanical properties, such like its higher strength-to-weight ratio and some specific characteristics [2,3].
Wiercigroch and Krivtsov [6] have shown that friction between the tool and workpiece could affects the dynamics of machining process and may cause the self-excited vibration of machining system.
For obtaining a step hole with high quality, the factors, which could effect the hole quality and stability of the machining process, such as stiffness of the machine tools and cutting tools,fixture of the workpiece, cutting parameters, and lubrication, need to be taken into consideration[13].
The wet machining were employed in the single-shot drilling to reduce the heat and mechanical damage to the pilot holes.
In recent years, aluminum alloys is considered to be one of the most promising material and have an increasing demand in the automotive and aerospace industries due to its unique physical and mechanical properties, such like its higher strength-to-weight ratio and some specific characteristics [2,3].
Wiercigroch and Krivtsov [6] have shown that friction between the tool and workpiece could affects the dynamics of machining process and may cause the self-excited vibration of machining system.
For obtaining a step hole with high quality, the factors, which could effect the hole quality and stability of the machining process, such as stiffness of the machine tools and cutting tools,fixture of the workpiece, cutting parameters, and lubrication, need to be taken into consideration[13].
The wet machining were employed in the single-shot drilling to reduce the heat and mechanical damage to the pilot holes.
Online since: September 2013
Authors: Marcel Vilches Casals, Vladimir Rodríguez Trujillo, Carles Labèrnia Badia
There are less concerns over the use of traditional or mechanical methods than resin methods, although there are both advantages and disadvantages of each method.
Advantages of being able to construct repairs using resins without dismantling the structure may make resin methods more advantageous than other carpentry or mechanical methods in some circumstances.
These formulations have a high adhesion to wood, high mechanical properties and low shrinkage, which is essential when used to fill gaps without losing contact during polymerization shrinkage [7].
In some trusses was detected excessive twist in supports, which was considered dangerous to mechanical effects.
At the end of the 1980s, some tests showed that the humidity is a limiting factor, between timber and epoxy resins, as it does not reach the cohesion strength of the timber [4, 15].
Advantages of being able to construct repairs using resins without dismantling the structure may make resin methods more advantageous than other carpentry or mechanical methods in some circumstances.
These formulations have a high adhesion to wood, high mechanical properties and low shrinkage, which is essential when used to fill gaps without losing contact during polymerization shrinkage [7].
In some trusses was detected excessive twist in supports, which was considered dangerous to mechanical effects.
At the end of the 1980s, some tests showed that the humidity is a limiting factor, between timber and epoxy resins, as it does not reach the cohesion strength of the timber [4, 15].
Online since: August 2019
Authors: Ravikumar Dumpala, K. Uday Venkat Kiran, Pranit Rangari, Anuj Prajapati, Zuveria Firdouz, Ajeet Srivastav, B. Ratna Sunil, B. Uday Kumar, Tathwika Jugunta, Bijoy Ramakrishnan
Heat treatment at 400˚C for one hour significantly affects properties of coatings.
It can be concluded that, the heat treatment temperature, rather than the pH of the coating solution, is the dominant factor in determining the final deposit hardness.
Bogani, Tribological properties of electroless Ni-P/diamond composite films, Materials research bulletin, 36 (2001) 1889-1902
Vijayaraghavan, Investigation of the surface properties of heat treated electroless Ni–P coating, Transactions of the IMF, 94 (2016) 265-273
Matik, Structural and wear properties of heat-treated electroless Ni-P alloy and Ni-P-Si3N4 composite coatings on iron based PM compacts, Surface and Coatings Technology, 302 (2016) 528-534
It can be concluded that, the heat treatment temperature, rather than the pH of the coating solution, is the dominant factor in determining the final deposit hardness.
Bogani, Tribological properties of electroless Ni-P/diamond composite films, Materials research bulletin, 36 (2001) 1889-1902
Vijayaraghavan, Investigation of the surface properties of heat treated electroless Ni–P coating, Transactions of the IMF, 94 (2016) 265-273
Matik, Structural and wear properties of heat-treated electroless Ni-P alloy and Ni-P-Si3N4 composite coatings on iron based PM compacts, Surface and Coatings Technology, 302 (2016) 528-534
Online since: March 2006
Authors: Si Young Sung, Young Jig Kim
A large
number of researchers have been trying Ti alloys in an attempt to combine most of their advantages,
such as high specific yield strength, good corrosion resistance, excellent fatigue property, and
biocompatibility [1-3].
In the early stage, the development of Ti alloys were mainly focused on the defense system technologies, thus their performance was a more crucial factor than the cost [4].
However, the cost problem cannot be overlooked any more, especially in the field of civil mechanical engineering.
Fig. 2 shows the results of EPMA mapping that not only the interstitial oxygen atoms but also the substitutional Al atoms dissolved from mold material affect the metal-mold reactions.
In the early stage, the development of Ti alloys were mainly focused on the defense system technologies, thus their performance was a more crucial factor than the cost [4].
However, the cost problem cannot be overlooked any more, especially in the field of civil mechanical engineering.
Fig. 2 shows the results of EPMA mapping that not only the interstitial oxygen atoms but also the substitutional Al atoms dissolved from mold material affect the metal-mold reactions.
Online since: August 2014
Authors: Andrej Babinec, František Duchoň, Jaroslav Hanzel, Jozef Rodina, Peter Paszto, Daniel Gajdosik
The accuracy of localization with NAVSTAR GPS depends on several well-known factors:
• satellite geometry,
• atmospheric effects,
• multipath effect,
• relativistic effects,
• other errors.
The choice of the coordinate system affects the accuracy of localization and convenient determination of the particular coordinates.
DOP and satelite geometry The accuracy of localization using GPS is affected by various sources of errors.
As the precision and physical properties of the receiver are given, the crucial problem is to choose appropriate method applicable with relatively low computing resources.
Kenderová, Friction Effect Analysis of a DC motor, American Journal of Mechanical Engineering (2013), Vol. 1, No. 1, pp. 1-5
The choice of the coordinate system affects the accuracy of localization and convenient determination of the particular coordinates.
DOP and satelite geometry The accuracy of localization using GPS is affected by various sources of errors.
As the precision and physical properties of the receiver are given, the crucial problem is to choose appropriate method applicable with relatively low computing resources.
Kenderová, Friction Effect Analysis of a DC motor, American Journal of Mechanical Engineering (2013), Vol. 1, No. 1, pp. 1-5