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Online since: November 2015
Authors: Pavel Topala, Alexandr Ojegov, Vitalie Besliu, Vladislav Rusnac, Dorin Guzgan
The number and the size of the conical asperities on the sample depend on the irregularities presented on the surfaces of both electrodes and on their areas, and don’t depend on the thickness and the volume of the electrodes.
Analysis on the lateral surface of the Taylor type cone has shown that in the process of solidification and constituting of solid material grains some additional nanometer-scale asperities are crystallized on their surface.
Increasing the number of electrical discharges leads to initial conical meniscus extraction, followed by the intensive oxidation of their surfaces below.
The current variation in a singular discharge impulse is manifold, which explain the increase of number of canals and conical asperities formation.
Analysis on the lateral surface of the Taylor type cone has shown that in the process of solidification and constituting of solid material grains some additional nanometer-scale asperities are crystallized on their surface.
Increasing the number of electrical discharges leads to initial conical meniscus extraction, followed by the intensive oxidation of their surfaces below.
The current variation in a singular discharge impulse is manifold, which explain the increase of number of canals and conical asperities formation.
Online since: September 2006
Authors: Igor S. Golovin
In metals,
only a limited number of dissipative mechanisms … can be used to achieve such performance.
It is not wise to mix ordinary materials with their uncountable number of different internal friction (IF) peaks, and real Hidamets with their intrinsic capacity to damp energy of mechanical vibrations.
One can find in the literature of the last century a large number of different mechanisms proposed for high damping and many different solutions for particular practical applications, from improving safety of Skiscribers in Earthquake zones, quality of musical devices and sport equipment to reducing noise in submarines and vibrations in helicopters, saw blades and gravitational wave detectors.
Cu [29] and Al [30], can exhibit relatively high damping due to a contribution of grain boundary dislocations in combination with a significant increase in yield strength as compared with the non-deformed state.
It is not wise to mix ordinary materials with their uncountable number of different internal friction (IF) peaks, and real Hidamets with their intrinsic capacity to damp energy of mechanical vibrations.
One can find in the literature of the last century a large number of different mechanisms proposed for high damping and many different solutions for particular practical applications, from improving safety of Skiscribers in Earthquake zones, quality of musical devices and sport equipment to reducing noise in submarines and vibrations in helicopters, saw blades and gravitational wave detectors.
Cu [29] and Al [30], can exhibit relatively high damping due to a contribution of grain boundary dislocations in combination with a significant increase in yield strength as compared with the non-deformed state.
Online since: July 2011
Authors: Sheng Dun Zhao, Yong Yi Li
Because the cross-section of extrusion tap is polygon, not a whole circle, every moment only part of teeth will extrude metal, leading to periodic acted pressure on metal, the change frequency is proportional to the number of edge of extrusion tap and rotational speed, under the periodic pressure, metal occurs plastic flow and deformation, forms internal thread finally.
In the metal internal structure of thread, grain refinement and dislocation density raise bring a better fibrous tissue continuity and higher yield strength
The structure parameters mainly include edge number , height of relief , lobe radius , taper angle of chamfer , length of chamfer , major diameter , pitch diameter and minor diameter of extrusion tap, length of gauging part [17].
The edge number will influence tool life, tapping torque and stability, height of relief and lobe radius will effect tapping torque, the taper angle and length of chamfer will effect the stability of tapping process, the major diameter, pitch diameter and minor diameter of extrusion tap, length of gauging part will effect the precision and surface quality of internal thread
In the metal internal structure of thread, grain refinement and dislocation density raise bring a better fibrous tissue continuity and higher yield strength
The structure parameters mainly include edge number , height of relief , lobe radius , taper angle of chamfer , length of chamfer , major diameter , pitch diameter and minor diameter of extrusion tap, length of gauging part [17].
The edge number will influence tool life, tapping torque and stability, height of relief and lobe radius will effect tapping torque, the taper angle and length of chamfer will effect the stability of tapping process, the major diameter, pitch diameter and minor diameter of extrusion tap, length of gauging part will effect the precision and surface quality of internal thread
Online since: May 2014
Authors: Gerardo Antonio Rosas Trejo, Rodrigo Alonso Esparza Muñoz, J. Luis López-Miranda, M.A. Espinosa-Medina, J.R. Romero-Romero
(2)
The ball-milling process increases the reacting species diffusion through the formation of various crystalline defects and the increment of the grain surface.
Thus for example, in FeAl2 intermetallic the O/Al ratio intensities increases with milling time, indicating that an increase in the number of phases associated with oxide and hydroxide oxygen was obtained.
Another parameter that can help to understand why the FeAl3 reacts with water more efficiently than FeAl2 corresponds to the number of Al-Al bonds.
Major physical adsorption in the FeAl3 intermetallic can be attributed to the presence of high number of Al-Al non-polar groups in comparison of FeAl2.
Thus for example, in FeAl2 intermetallic the O/Al ratio intensities increases with milling time, indicating that an increase in the number of phases associated with oxide and hydroxide oxygen was obtained.
Another parameter that can help to understand why the FeAl3 reacts with water more efficiently than FeAl2 corresponds to the number of Al-Al bonds.
Major physical adsorption in the FeAl3 intermetallic can be attributed to the presence of high number of Al-Al non-polar groups in comparison of FeAl2.
Online since: March 2016
Authors: Wen Long Xiao, Jian Bin Zhang, Hiroshi Yamagata, Jiu Xin Chen, Cong Xu, Mao Wen Liu, Chao Li Ma
(1)
Where ASi represents the area and n is the number of measured eutectic Si particles.
There are a number of explanations for this phenomenon.
A large number of fine dimples without visual porosities are observed in SD alloy, as shown in Fig. 6(b).
Akiba, Modeling the effects of cooling rate, hydrogen content, grain refiner and modifier on microporosity formation in Al A356 alloys.
There are a number of explanations for this phenomenon.
A large number of fine dimples without visual porosities are observed in SD alloy, as shown in Fig. 6(b).
Akiba, Modeling the effects of cooling rate, hydrogen content, grain refiner and modifier on microporosity formation in Al A356 alloys.
Online since: August 2004
Authors: Ki Bok Kim, Sang Cheon Kim, Jong Whan Lee, Sang Ha Noh
Multivariate analyses on RF impedance of grain and seed have been
reported (Lawrence et al., 1998) and some good promising methodologies for moisture content Title of Publication (to be inserted by the publisher)
determination are being presented.
The impedance is expressed as; CjXRZ −= (1) where, Z is impedance [ohm], R (ω) is resistance [ohm], XC is capacitive reactance [ohm] and j is the imaginary number, j2 =-1.
The number of optimal factors to be retained is usually determined by cross validation method (Svante and Michel, 1998).
And the jth linear combination or component, tj for PCR and PLSR was represented as (Osborne, et al., 1993, Williams and Norris, 1990); 3052041035211 xwxwxwxwxwt j j j j jj ++++= (9) with ∑ = = p k k n jn yx yx w 1 2 ),(cov ),cov( (10) where, wjn is weight vector, cov notes the covariance, n varying from 1 to p and p is number of variables The results of analyses are summarized in Table 1.
The impedance is expressed as; CjXRZ −= (1) where, Z is impedance [ohm], R (ω) is resistance [ohm], XC is capacitive reactance [ohm] and j is the imaginary number, j2 =-1.
The number of optimal factors to be retained is usually determined by cross validation method (Svante and Michel, 1998).
And the jth linear combination or component, tj for PCR and PLSR was represented as (Osborne, et al., 1993, Williams and Norris, 1990); 3052041035211 xwxwxwxwxwt j j j j jj ++++= (9) with ∑ = = p k k n jn yx yx w 1 2 ),(cov ),cov( (10) where, wjn is weight vector, cov notes the covariance, n varying from 1 to p and p is number of variables The results of analyses are summarized in Table 1.
Online since: October 2014
Authors: Xiao Yue Zhang, Kai Ma, Chun Chao Hu, Shan Qiang Feng, Wen Qing Lan, Hu Chen
Applications can issue any number of packets at any time, which not requires prior approval and not notify the network.
Such a system can clearly distinguish and guarantee the quality of each service and provide the most fine-grained quality of service differentiation to network.
Inter-Serv model demands high requirements for equipment, when there exist a large number of data streams in the network, the storage and processing capacity of device will encounter a lot of pressure.
Each queue has a weighted value, also known as the scheduling weight, round scheduling is conducted in queues according to the weight to ensure that each queue shares a certain proportion of service, scheduling weight indicates that the proportion the scheduling resources are used when devices are scheduling the queue packets. 3.2.3 DRR The disadvantage of WRR is that weights is proportional to the number of packets, the network whose average length of the packet is clear is more appropriate to use WRR, while the weight of the queue does not reflect in the actual queue bandwidth in the networks where the queue packet length varies.
Such a system can clearly distinguish and guarantee the quality of each service and provide the most fine-grained quality of service differentiation to network.
Inter-Serv model demands high requirements for equipment, when there exist a large number of data streams in the network, the storage and processing capacity of device will encounter a lot of pressure.
Each queue has a weighted value, also known as the scheduling weight, round scheduling is conducted in queues according to the weight to ensure that each queue shares a certain proportion of service, scheduling weight indicates that the proportion the scheduling resources are used when devices are scheduling the queue packets. 3.2.3 DRR The disadvantage of WRR is that weights is proportional to the number of packets, the network whose average length of the packet is clear is more appropriate to use WRR, while the weight of the queue does not reflect in the actual queue bandwidth in the networks where the queue packet length varies.
Online since: January 2014
Authors: Roman S. Laptev, Viktor N. Kudiiarov, Georgy V. Garanin, Andrey M. Lider, Yurii Bordulev
However some papers [4-7] have shown that hydrogen not only interacts with existing defects but also induces formation of a large number of new defects.
The average lifetime is independent of the number of artificially created components and restrictions [22].
In addition growth of long-lived component intensity I2 indicates formation of a large number of new vacancy type defects.
Islamgaliev, Positron-Lifetime Investigation of Thermal Stability of Ultra-Fine Grained Nickel, Phys. stat. sol.
The average lifetime is independent of the number of artificially created components and restrictions [22].
In addition growth of long-lived component intensity I2 indicates formation of a large number of new vacancy type defects.
Islamgaliev, Positron-Lifetime Investigation of Thermal Stability of Ultra-Fine Grained Nickel, Phys. stat. sol.
Online since: July 2020
Authors: Pei Yao Li, Guo Jun Song, Zheng Gu, Li Wang, Shi Hai Zhao
The obtained strands were grained and vigorously dried at 80 °C in an oven.
Figure 5: The mechanism of three polyethylene molecular structure to form submicroscopic morphology composite From figure 5 we could see that three kinds of polyethylene were added into the same organic montmorillonite, during the polyethylene molecules and montmorillonite intercalation composite process, due to the existence of a large number of branched LDPE molecular chains, the higher degree of branching and the longer branched chains, there were only very small part of the LDPE molecular chains into the organic layers of montmorillonite, MMT spacing did not chang during this process, the external shear force could not open the montmorillonite layer force, so the final form of the conventional micron LDPE/OMMT composites were shown in the drawings.
While the HDPE molecular chains had smaller and shorter branched chains, so early in the intercalation, there were a large number of molecular chains into the layers, so the interacting force between the layers of montmorillonite was weakened.
Acknowledgments This work was supported by [the financial support from the NSFC ] under Grant [Number:51503111].
Figure 5: The mechanism of three polyethylene molecular structure to form submicroscopic morphology composite From figure 5 we could see that three kinds of polyethylene were added into the same organic montmorillonite, during the polyethylene molecules and montmorillonite intercalation composite process, due to the existence of a large number of branched LDPE molecular chains, the higher degree of branching and the longer branched chains, there were only very small part of the LDPE molecular chains into the organic layers of montmorillonite, MMT spacing did not chang during this process, the external shear force could not open the montmorillonite layer force, so the final form of the conventional micron LDPE/OMMT composites were shown in the drawings.
While the HDPE molecular chains had smaller and shorter branched chains, so early in the intercalation, there were a large number of molecular chains into the layers, so the interacting force between the layers of montmorillonite was weakened.
Acknowledgments This work was supported by [the financial support from the NSFC ] under Grant [Number:51503111].
Online since: January 2021
Authors: Qun Bo Fan, Yu Gao, Hong Yu, Yu Zhou, Xin Jie Zhu
First, special samples are required in many cases, such as diffusion couples of multiple alloys [5], and thin film samples prepared by magnetron sputtering technique [6], which requires high technology and cost; the second is that alloy systems with multipe principal elements studied are relatively simple, and some methods were used to establish the relationship between composition and performance, such as CALPHAD (CALculation of PHAse Diagrams) [7, 8], requiring a large amount of data, but the number of elements analyzed is small.
Some high-throughput tests combining nanoindentation tests with EPMA technology to test alloys have proven to be efficient, and a large number of compositions and performance data can be obtained just by testing a small number of materials [5, 8].
It can be seen that the microstructure of the titanium alloy used in this test consists of two phases, α phase and β phase, and is a typical equiaxed structure with a grain size of about 5 μm.
Some high-throughput tests combining nanoindentation tests with EPMA technology to test alloys have proven to be efficient, and a large number of compositions and performance data can be obtained just by testing a small number of materials [5, 8].
It can be seen that the microstructure of the titanium alloy used in this test consists of two phases, α phase and β phase, and is a typical equiaxed structure with a grain size of about 5 μm.