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Online since: September 2016
Authors: Li Li Hu
Composition and Properties.
All above factors can greatly influence the local air condition
Physical and chemical properties of coal gangue and gangue sintered brick quality [J].
The discussion of factors influencing the coal gangue sintered brick production technology [J].
Coal gangue sintered hollow brick of selection of raw materials and process factors influencing study [J].
All above factors can greatly influence the local air condition
Physical and chemical properties of coal gangue and gangue sintered brick quality [J].
The discussion of factors influencing the coal gangue sintered brick production technology [J].
Coal gangue sintered hollow brick of selection of raw materials and process factors influencing study [J].
Online since: August 2004
Authors: Sang Woo Kim, Jong Wook Kim, Tae Joon Park, Poo Gyeon Park
The dissolved gas-in-oil analysis (DGA) is
very popular diagnostic method, but is not a proper technique to identify mechanical faults.
Until now, such diagnostic methods of a transformer as the dielectric dissipation factor (DDF) measurement, the partial discharge (PD) measurement, the dissolved gas in oil analysis (DGA), and so on, are provided.
If any of the mechanical faults occur in a certain phase of the transformer, the shape of transfer functions deviates from those of normal ones.
However, correlation coefficient has a serious problem under a certain condition, and standard deviation, the most popular criterion, is dominantly affected by a few large values which take relatively small portions in a whole frequency domain.
If ik is larger than 1, the ith factor of SSRE equals ( ) ( )2 2 11/ −=− iii kxy .
Until now, such diagnostic methods of a transformer as the dielectric dissipation factor (DDF) measurement, the partial discharge (PD) measurement, the dissolved gas in oil analysis (DGA), and so on, are provided.
If any of the mechanical faults occur in a certain phase of the transformer, the shape of transfer functions deviates from those of normal ones.
However, correlation coefficient has a serious problem under a certain condition, and standard deviation, the most popular criterion, is dominantly affected by a few large values which take relatively small portions in a whole frequency domain.
If ik is larger than 1, the ith factor of SSRE equals ( ) ( )2 2 11/ −=− iii kxy .
Online since: August 2010
Authors: Ming Hu, Suo Xian Yuan, Xue Long Wen
The Kinematical Performance Analysis of a Kind of Parallel
Turning-Grinding Machine
S.X.Yuan
1, a X.L.Wen
1,b M.Hu
1,c
1
School of Mechanical Engineering & Automation, Northeastern University, PRC
a
sxyuan@mail.neu.edu.cn, bwenxuelong1985@163.com, cminghu@mail.neu.edu.cn
Keywords: Parallel Mechanism, kinematical performance, jacobia matrix
Abstract.
Workspace As the 2-PRR parallel institutions in the X-Y plane for translational, two sliders do the same straight line, so drivers will not interfere with blocks, so this body is mainly due to track length and angle between two factors affecting rod work space.
Conclusions In this paper, is first introduced by the 2-PRR Parallel institutions of the kinematic properties.
Planar 2-DOF parallel mechanism and size of shape Singularity Analysis[J],Mechanical Design,2002,(Supplement):75-76 [3] WANG Xi min; FU Yu jin; CAI Guang qi; HU Ming.
Workspace As the 2-PRR parallel institutions in the X-Y plane for translational, two sliders do the same straight line, so drivers will not interfere with blocks, so this body is mainly due to track length and angle between two factors affecting rod work space.
Conclusions In this paper, is first introduced by the 2-PRR Parallel institutions of the kinematic properties.
Planar 2-DOF parallel mechanism and size of shape Singularity Analysis[J],Mechanical Design,2002,(Supplement):75-76 [3] WANG Xi min; FU Yu jin; CAI Guang qi; HU Ming.
Online since: August 2013
Authors: Zhi Gang Jia, Fu Rong Li, Ke Li
Tianyi Han (2008) thought that the strength and stress distribution of rock and soil will be changed by temperature and water in three ways: freeze changes the structure of soil; phase transition between water and ice results in frost heave; water migration leads to the uneven distribution of water [4].The mechanical properties of frozen soil and freezing and thawing of the soil depended on heat transfer when phase transition and phase transition process [5].
The two factors affect the volume changes of frozen soil: the volume strain caused by temperature changes, the volumetric strain produced by moisture migration and phase transitions.
After calculation of each step for temperature field, the language fish is used to access the relevant parameters of the stress and seepage fields affected by temperature, so after every coupling calculation, then use language fish to modify the thermal parameters.
Mechanical parameters and thermal parameters are shown in table 1 and table 2.
The two factors affect the volume changes of frozen soil: the volume strain caused by temperature changes, the volumetric strain produced by moisture migration and phase transitions.
After calculation of each step for temperature field, the language fish is used to access the relevant parameters of the stress and seepage fields affected by temperature, so after every coupling calculation, then use language fish to modify the thermal parameters.
Mechanical parameters and thermal parameters are shown in table 1 and table 2.
Online since: August 2012
Authors: Marcello Filgueira, Luciano José de Oliveira
Compression tests were carried out to evaluate the elastic properties of composites, i.e., modulus of elasticity (E) and yield stress (σe), aiming at the assessment of the metal matrix-diamond adhesion.
The alloys properties can be improved with addition of some materials in definite proportions.
One can observe that for optimum productivity and cutting efficiency, the matrix should have good mechanical properties, because during cutting operation, diamonds particles are subjected to stress by direct contact with work piece.
These stresses are transmitted directly to the bonding matrix, so its mechanical behavior is very important.
In a general way, one can see that the yield stress did not change significantly (350 MPa in average), except for the composite M4 showing a value slightly lower and composite M3, which reached a value a little higher, reaching the best properties.
The alloys properties can be improved with addition of some materials in definite proportions.
One can observe that for optimum productivity and cutting efficiency, the matrix should have good mechanical properties, because during cutting operation, diamonds particles are subjected to stress by direct contact with work piece.
These stresses are transmitted directly to the bonding matrix, so its mechanical behavior is very important.
In a general way, one can see that the yield stress did not change significantly (350 MPa in average), except for the composite M4 showing a value slightly lower and composite M3, which reached a value a little higher, reaching the best properties.
Online since: February 2011
Authors: Imtiaz Ahmed Choudhury, M. Azuddin, Z. Taha
Electrical discharge machining (EDM) and micro mechanical machining was used to fabricate micro shape cavity on aluminum mold.
Plastic materials are relatively less costly, mass production capability, and good mechanical properties [1].
From the conducted experiment, surface tension has significant affects on the filling flow of small width and thickness.
Griffiths et al. 2 identified the factors affecting micro flow behavior, which are melt temperature, mold temperature, injection speed and injection pressure.
Plastic materials are relatively less costly, mass production capability, and good mechanical properties [1].
From the conducted experiment, surface tension has significant affects on the filling flow of small width and thickness.
Griffiths et al. 2 identified the factors affecting micro flow behavior, which are melt temperature, mold temperature, injection speed and injection pressure.
Online since: April 2013
Authors: Ming Jie Zhou, Jin Li Qiao, Wen Ling Tian, Fang Lu Jiang, Kun Zhao
According to the experimental results of these four walls subjected to horizontal reciprocating loads, we know that the grid-mesh frame wall's breaking form are in stages and multiple modes, and the main influencing factors are height-width ratio and grid form, what's more, with cast-in-place plaster as fill material, could not only improve the level of the wall bearing capacity and stiffness, but also improve the ductility and seismic energy dissipation capacity.
Table 1 The basic parameters of specimens Specimen Numbers Specimen size ( mm)(High×width× thick) Wall height-width ratio Gypsum situation WGQ-1 1950×1550×125 0.8 No SWGQ-1 1950×1550×125 0.8 Yes WGQ-2 2625×1550×125 0.6 No SWGQ-2 2625×1550×125 0.6 YES (a)WGQ-1,SWGQ-1 (b)WGQ-2,SWGQ-2 Fig 1 The size of Component a)Rib beam (b)Rib column (c)Frame column (d)Frame beam Fig.2 The section size and reinforcement Mechanical properties of material.
The main influence factors of bearing capacity and failure mode is height-width ratio of wall, opening of window and cast-in-place gypsum .Wall member has a good seismic performance.
The ultimate bearing capacity of the wall is not simple improve as rib beam longitudinal bar or rib column of longitudinal reinforcement increases .Section reinforcement ratio of Rib beam rib column affect the cross section characteristics of he frame structure, so ,also influence the collaborative working performance of grid and gypsum .
Table 1 The basic parameters of specimens Specimen Numbers Specimen size ( mm)(High×width× thick) Wall height-width ratio Gypsum situation WGQ-1 1950×1550×125 0.8 No SWGQ-1 1950×1550×125 0.8 Yes WGQ-2 2625×1550×125 0.6 No SWGQ-2 2625×1550×125 0.6 YES (a)WGQ-1,SWGQ-1 (b)WGQ-2,SWGQ-2 Fig 1 The size of Component a)Rib beam (b)Rib column (c)Frame column (d)Frame beam Fig.2 The section size and reinforcement Mechanical properties of material.
The main influence factors of bearing capacity and failure mode is height-width ratio of wall, opening of window and cast-in-place gypsum .Wall member has a good seismic performance.
The ultimate bearing capacity of the wall is not simple improve as rib beam longitudinal bar or rib column of longitudinal reinforcement increases .Section reinforcement ratio of Rib beam rib column affect the cross section characteristics of he frame structure, so ,also influence the collaborative working performance of grid and gypsum .
Online since: January 2005
Authors: M.S. Yong, S.L. Liu, Qing Feng Liu, B.H. Hu
To cater for industrial application, polymer/clay nanocomposites exhibit improved mechanical
properties, flame retardance, high heat distortion temperature, enhanced barrier properties and
better dimensional stability at low clay content [7].
The improved mechanical and thermal properties will make the material useful in aerospace and automotive industry.
The enhanced barrier properties combined with good transparency will make them ideal packaging materials.
The effect of clay content on the mechanical properties of PP/clay nanocomposites is shown in Fig. 3.
It shows that nano technology can be used to enhance the mechanical properties of the polymeric material.
The improved mechanical and thermal properties will make the material useful in aerospace and automotive industry.
The enhanced barrier properties combined with good transparency will make them ideal packaging materials.
The effect of clay content on the mechanical properties of PP/clay nanocomposites is shown in Fig. 3.
It shows that nano technology can be used to enhance the mechanical properties of the polymeric material.
Online since: July 2011
Authors: Jie Chen, Cheng Hui Gao, Bing Wei He
It can solve some holes with complex plane boundary curves, but it also neglected the around meshes properties of the holes during the process, and hole filling results is not very satisfactory.
For non-closed triangular mesh model, model boundary and hole boundary are both constituted of boundary edges, and the composition of the two boundary properties are the same.
Badly Oriented Meshes Deletion A badly oriented triangle facet which has two boundary edges in its three edges are as shown in Fig. 3, and one can notice that a triangle defined by two boundary edges can rotate around its interior edge without affecting the other triangles.
China Mechanical Engineering, 16, 12(2005), p. 2072
China Mechanical Engineering, 19, 8(2008), p. 949.
For non-closed triangular mesh model, model boundary and hole boundary are both constituted of boundary edges, and the composition of the two boundary properties are the same.
Badly Oriented Meshes Deletion A badly oriented triangle facet which has two boundary edges in its three edges are as shown in Fig. 3, and one can notice that a triangle defined by two boundary edges can rotate around its interior edge without affecting the other triangles.
China Mechanical Engineering, 16, 12(2005), p. 2072
China Mechanical Engineering, 19, 8(2008), p. 949.
Online since: July 2012
Authors: Fang Zhao, Jun Guo Li, Long Liu, Jun Feng Zhu, Guang Hua Zhang
It is our primary interest to develop environmentally safe additives, such as natural plant-based and starch-based additives, for the high concentration CWS with minimal viscosity, nonsettling, and free-flowing properties.[4] The starch widely found in nature, is a rich natural resource, particularly in China.
In a three-necked flask equipped with mechanical stirrer, reflux condenser and thermometer, the appropriate amounts of distilled water and starch were added, gently stirred, heated to 90 °C, then kept at the temperature for 30 min.
The thermal properties were examined by thermogravimetric analysis (TGA), which was carried out by TGA Q500 thermogravimetric analysis instrument (TA Instrument Corp., USA) under nitrogen atmosphere at a scan rate of 20 °C /min.
Zeta potential indicates coal interparticle electrostatic repulsion, and thereby, directly affecting the apparent viscosity of CWS.
The dispersant makes the slurry pseudo-plastic fluid with a shear thinning property meeting the needs in practical application.
In a three-necked flask equipped with mechanical stirrer, reflux condenser and thermometer, the appropriate amounts of distilled water and starch were added, gently stirred, heated to 90 °C, then kept at the temperature for 30 min.
The thermal properties were examined by thermogravimetric analysis (TGA), which was carried out by TGA Q500 thermogravimetric analysis instrument (TA Instrument Corp., USA) under nitrogen atmosphere at a scan rate of 20 °C /min.
Zeta potential indicates coal interparticle electrostatic repulsion, and thereby, directly affecting the apparent viscosity of CWS.
The dispersant makes the slurry pseudo-plastic fluid with a shear thinning property meeting the needs in practical application.