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Online since: June 2024
Authors: Fawzi Sh. Alnasur, Riyadh S. AL-Turaihi
Bell, Maximum temperature difference in a single-stage thermoelectric device through distributed transport properties, Int.
Choi, Optical properties and swelling of thin film perfluorinated sulfonic-acid ionomer, ECS Trans. 92 (8) (2019) 197
Parametric study of major factors affecting heat transfer enhancement in a circular tube with vortex generator pairs.
American Society of Mechanical Engineers
A Study of the Chemical and Physical Properties of Cane as a Biofuel After Thermal Treatment Processes (Tarification).
Choi, Optical properties and swelling of thin film perfluorinated sulfonic-acid ionomer, ECS Trans. 92 (8) (2019) 197
Parametric study of major factors affecting heat transfer enhancement in a circular tube with vortex generator pairs.
American Society of Mechanical Engineers
A Study of the Chemical and Physical Properties of Cane as a Biofuel After Thermal Treatment Processes (Tarification).
Online since: November 2019
Authors: Pavel S. Nesterenko, Elena N. Smirnova, Julius L. Tchigirinsky
Performance properties are mainly affected by the following: roughness parameter Ra, surface residual stresses and surface microhardness [1].
One of the reasons for such discrepancy is the absence of adjustment for tool material properties in calculations.
The following factors were chosen as the factors determining the value of response function: cutting speed V (90, 135, 180 [m/min]), tool material thermal conductivity factor λ (11, 27, 50 [W/mK]), supply S (0.083; 0.166; 0.256 [mm/rev]).
Possibility of comparison of the factors by the level of significance of their influence on the response function is provided by performance of set of Gauss-Markov conditions [9] – reduction of the factors to the uniform scale and generation of the model in non-dimensional coordinate space.
- stabilize the quality parameters of the machined surfaces due to stabilization of force conditions of the processing which will subsequently lead to decrease in variation of performance properties of the parts and as a consequence decrease the probability of defective parts.
One of the reasons for such discrepancy is the absence of adjustment for tool material properties in calculations.
The following factors were chosen as the factors determining the value of response function: cutting speed V (90, 135, 180 [m/min]), tool material thermal conductivity factor λ (11, 27, 50 [W/mK]), supply S (0.083; 0.166; 0.256 [mm/rev]).
Possibility of comparison of the factors by the level of significance of their influence on the response function is provided by performance of set of Gauss-Markov conditions [9] – reduction of the factors to the uniform scale and generation of the model in non-dimensional coordinate space.
- stabilize the quality parameters of the machined surfaces due to stabilization of force conditions of the processing which will subsequently lead to decrease in variation of performance properties of the parts and as a consequence decrease the probability of defective parts.
Online since: October 2014
Authors: Marlena Rajczyk, Jarosław Rajczyk, S.A. Evtyukov, A.A. Schimanova
The properties of packed materials are not always included in the technical analysis process of the pneumatic transportation system, especially in the methodology of constructional and technological calculations.
Therefore the material must be additionally affected by vibration in order to release the particle bonding forces, the so-called autohesion and adhesion forces that emerge at the walls of volume; the forces affected by vibration reduce their values to quantities equal to the gravity force of particles that can be described by the relation (1) [7]: (1) where: h – number of contacts of a particle bonding point m – particie mass g – acceleration The analysis of materials that evaluate the practical solutions in such systems has demonstrated that in conveying PM the effectiveness of sucking in suction intake devices depends on the density of the material and approaches zero.
After analysing the manner of mechanical fragmentation of packed materials, it was concluded that the most prospective way to improve the pneumatic transportation process of packed materials is using the energy of compressed air in the suction head in order to fragment packed materials.
Causing pneumatic disintegration that has a direct influence on the physical and mechanical properties of the packed material – thereby improving the physical state of the transported material itself, and suction conditions in the output collecting zone, guarantee the stability of operation of the whole line.
To define optimal parameters and evaluate the effectiveness of the process of pneumatic fragmenting-disintegrating packed bulk materials, one must determine the factors that influence its behavior.
Therefore the material must be additionally affected by vibration in order to release the particle bonding forces, the so-called autohesion and adhesion forces that emerge at the walls of volume; the forces affected by vibration reduce their values to quantities equal to the gravity force of particles that can be described by the relation (1) [7]: (1) where: h – number of contacts of a particle bonding point m – particie mass g – acceleration The analysis of materials that evaluate the practical solutions in such systems has demonstrated that in conveying PM the effectiveness of sucking in suction intake devices depends on the density of the material and approaches zero.
After analysing the manner of mechanical fragmentation of packed materials, it was concluded that the most prospective way to improve the pneumatic transportation process of packed materials is using the energy of compressed air in the suction head in order to fragment packed materials.
Causing pneumatic disintegration that has a direct influence on the physical and mechanical properties of the packed material – thereby improving the physical state of the transported material itself, and suction conditions in the output collecting zone, guarantee the stability of operation of the whole line.
To define optimal parameters and evaluate the effectiveness of the process of pneumatic fragmenting-disintegrating packed bulk materials, one must determine the factors that influence its behavior.
Online since: November 2012
Authors: Bin Shen, Fang Hong Sun, Xin Chang Wang
Among the common materials adopted as substrates, Ti is unique to be used in industrial, aerospace and biomaterial devices for its high strength-to-weight ratio, melting point, chemical inertness and biocompatibility properties [2].
SiC is a rich and extensive resource in nature with nice mechanical properties and small thermal expansion coefficient, which makes it a promising alternative material of WC-Co and an applicable material of interlayer [3].
The adhesive strength between the substrate and the film is one of the important factors characterizing the quality of film.
Vohra, Tribological properties of undoped and boron-doped nanocrystalline diamond films, Thin Solid Films, 517 (2008) 800-804 [10] F.H.
Bello and et al, Film thickness effects on mechanical and tribological properties of nitrogenated diamond-like carbon films, Surf.
SiC is a rich and extensive resource in nature with nice mechanical properties and small thermal expansion coefficient, which makes it a promising alternative material of WC-Co and an applicable material of interlayer [3].
The adhesive strength between the substrate and the film is one of the important factors characterizing the quality of film.
Vohra, Tribological properties of undoped and boron-doped nanocrystalline diamond films, Thin Solid Films, 517 (2008) 800-804 [10] F.H.
Bello and et al, Film thickness effects on mechanical and tribological properties of nitrogenated diamond-like carbon films, Surf.
Online since: October 2013
Authors: Tian Pei Chen, Lei Mei, Ji Quan Hu, Yong Zhi Li
Intermediate support is also the important influence factors of conveyor’s transportation performance as an indispensable component of the vertical screw conveyor.
DEM was used by Cleary to study the model that material falls down from hopper of screw conveyor with 45° Angle[6], then Cleary has a further study of the influence that the particle shape has on downwelling and transport properties of screw conveyor[7].
(2) The physical properties of particles and the geometry In the simulation of the actual system, the rationality of physical properties of materials is the key to ensure that the simulation results is close to the reality, the physical properties of the materials involved in simulation are shown in Table 1 and Table 2 [8].
Table 1 Material Properties Table Material Poisson's ratio Shear Modulus(Pa) Density (kg/m3) Rice 0.40 1053 Steel 0.30 7850 Table 2 Contact Property Table Interaction.
Continuous conveyor Mechanical Design Handbook [M].Beijin: China Railway Press,2001
DEM was used by Cleary to study the model that material falls down from hopper of screw conveyor with 45° Angle[6], then Cleary has a further study of the influence that the particle shape has on downwelling and transport properties of screw conveyor[7].
(2) The physical properties of particles and the geometry In the simulation of the actual system, the rationality of physical properties of materials is the key to ensure that the simulation results is close to the reality, the physical properties of the materials involved in simulation are shown in Table 1 and Table 2 [8].
Table 1 Material Properties Table Material Poisson's ratio Shear Modulus(Pa) Density (kg/m3) Rice 0.40 1053 Steel 0.30 7850 Table 2 Contact Property Table Interaction.
Continuous conveyor Mechanical Design Handbook [M].Beijin: China Railway Press,2001
Online since: November 2014
Authors: Inderpreet Kaur, Shriniwas Yadav, Sukhbir Singh, Vanish Kumar, Shweta Arora, Deepika Bhatnagar
SWCNTs are very important type of CNTs, because their properties vary significantly with chiral vectors.
The band gap of SWCNTs can vary from 0 to 2eV, thus electrical properties can be metallic as well as semiconducting.
Electronic properties of GNR vary with the edge pattern as well as the width of the sheet.
Geim, The electronic properties of graphene, Rev.
Charlier, Electronic properties and quantum transport in Graphene-based nanostructures, Eur.
The band gap of SWCNTs can vary from 0 to 2eV, thus electrical properties can be metallic as well as semiconducting.
Electronic properties of GNR vary with the edge pattern as well as the width of the sheet.
Geim, The electronic properties of graphene, Rev.
Charlier, Electronic properties and quantum transport in Graphene-based nanostructures, Eur.
Online since: December 2010
Authors: Jin Song Lei, Qing Ma, Bo Xue
Introduction
Double-tower connecting structure is a kind of complicated structure form with two single-tower as major structure which are connected by linkwork(corridor, for example).This kind of structure has great calculation workload, complex stress, and many influential factors.
Compared with ordinary high-rise buildings, the vibration performance, mechanical property, failure mode and analytical model of double-tower connecting structure are much more complicated.
In this paper, an unequal altitude double-tower connecting structure is taken as an example, whose dynamic property and seismic response are analyzed using the finite element analysis software, ANSYS, and some reasonable advice are put forward for architectural design.
The statements of above illustrate that the shear force on the bottom is affected significantly by connecting position.
(3) The variation of connecting position mainly affects the stiffness in X direction, therefore, after inputting earthquake wave in X direction, the maximum shear force on the bottom varies significantly.
Compared with ordinary high-rise buildings, the vibration performance, mechanical property, failure mode and analytical model of double-tower connecting structure are much more complicated.
In this paper, an unequal altitude double-tower connecting structure is taken as an example, whose dynamic property and seismic response are analyzed using the finite element analysis software, ANSYS, and some reasonable advice are put forward for architectural design.
The statements of above illustrate that the shear force on the bottom is affected significantly by connecting position.
(3) The variation of connecting position mainly affects the stiffness in X direction, therefore, after inputting earthquake wave in X direction, the maximum shear force on the bottom varies significantly.
Online since: December 2010
Authors: Tasha Reshetnikova, Milyausha R. Salakhova, Andrey V. Shcherbakov, Larisa Khakimova
Discovery of extraordinary properties in BNM provoked interest in searching the ways for their effective application.
The Nanostuctured Ti (nanoTi) is a new-class material with enhanced mechanical and unique bio properties.
Moreover, nanoTi due to its novel mechanical and biological properties opens wide possibilities for developments in surgery and orthopedics.
Economic factors.
One of the important success factors is establishing of a spin-off company responsible for elaboration and realization of a strategy for promotion of BNM to the consumer’s market, settlement of copyright transfers for the intellectual property.
The Nanostuctured Ti (nanoTi) is a new-class material with enhanced mechanical and unique bio properties.
Moreover, nanoTi due to its novel mechanical and biological properties opens wide possibilities for developments in surgery and orthopedics.
Economic factors.
One of the important success factors is establishing of a spin-off company responsible for elaboration and realization of a strategy for promotion of BNM to the consumer’s market, settlement of copyright transfers for the intellectual property.
Online since: October 2010
Authors: José Renato Coury, José Antônio Silveira Gonçalves, Vádila Giovana Guerra, M.A.F. Daher
The size of the collector droplet is an important parameter that affects the performance of the equipment.
According to studies by Guerra et al. [7, 8], such factors influence the droplet size significantly.
This is a useful technique in all experimental areas of engineering because if it is possible to identify the relevant factors involved in a physical process, a dimensional analysis may form and reveal a relationship between the factors.
Results and Discussion To apply dimensional analysis to a process, the relevant physical factors that influence a process must first be established.
Tanasawa: Transactions of the Society of Mechanical Engineers Vol.4 (1938), p.86
According to studies by Guerra et al. [7, 8], such factors influence the droplet size significantly.
This is a useful technique in all experimental areas of engineering because if it is possible to identify the relevant factors involved in a physical process, a dimensional analysis may form and reveal a relationship between the factors.
Results and Discussion To apply dimensional analysis to a process, the relevant physical factors that influence a process must first be established.
Tanasawa: Transactions of the Society of Mechanical Engineers Vol.4 (1938), p.86
Online since: June 2014
Authors: Kunio Takekoshi, Kazukuni Niwa
Dog-bone Specimen: Conventionally, various dog-bone type specimens have been widely used for tensile tests to obtain mechanical properties of materials.
To improve failure predictions, rate dependent failure strain is multiplied by two scaling factors depending on both element size and triaxiality as given by Eq. 2.
εfail = εfail(εeq,p)Fscaling(Lelem)Gscaling(η), η=p/σvm , (2) where, Fscaling and Gscaling are scaling factors depending on element size Lelem and triaxality η, respectively.
Figure 6 shows the scale factors obtained for these models.
Fig. 6 Scale factors of the failure strain as a function of element size.
To improve failure predictions, rate dependent failure strain is multiplied by two scaling factors depending on both element size and triaxiality as given by Eq. 2.
εfail = εfail(εeq,p)Fscaling(Lelem)Gscaling(η), η=p/σvm , (2) where, Fscaling and Gscaling are scaling factors depending on element size Lelem and triaxality η, respectively.
Figure 6 shows the scale factors obtained for these models.
Fig. 6 Scale factors of the failure strain as a function of element size.