Search Options

Sort by:

Sort search results by

Publication Type:

Publication Type filter

Open access:

Publication Date:

Periodicals:

Periodicals filter

Search results

Online since: September 2014
Authors: Dan Xiao, Yan Hong Ke, Yi Ju Yang, Lei Liu, Yang Yu Yuan, Cheng Bo Yu
The software provides good interactive interface and graphics display surface, but also sets aside network port as follow-platform extension. 0 Introduction Extensively developing microsurgical techniques in the medical field of ophthalmology (such as cataract, intraocular lens implantation , glaucoma , corneal transplants , radial keratotomy and LASIK, etc. ) , because the operative mechanical injury or the toxic effects of drugs may cause corneal endothelial damage, therefore measurement of corneal endothelial cell number, density , shape, etc. is significant before and after surgery.
Initially using a traditional manual cell counting method of examination, it not only takes a lot of manpower and time, and in terms of efficiency and accuracy count vulnerable restricts human subjective factors [1].
(a) Endothelial analysis system programming (b) Image processing algorithm Fig.3 Endothelial analysis system flowcharts The purpose of image segmentation is to extract the cell borders, achieving the separation of background and foreground, which image segmentation directly affects the subsequent edge detection.
H1=, H2= H1 obeys the statistical properties of the Gaussian distribution, and the value between 0 to 1 in the mask.
Online since: June 2010
Authors: Yong Xiang Zhao, Lian You Yu
Performances of cast steels are highly relative to fabrication technologies, e.g. the air cavities shapes and sizes were greatly affected by the cast cooling velocity and the wear resistance of high Cr cast steel was mostly relative to the austenite content [5].
Mechanical properties are around 188 GPa for Young's modulus, 254 MPa 0.2% proof strength, 453 MPa ultimate tensile strength, 26 % elongation, and 45 % reduction of area.
Table 2 Statistical parameters sa,av, sa,rms, and ns for present material by CA, DMA, ZKA and MLA Parameter CA DMA ZKA MLA sa,av (MPa) 139.27 139.23 138.86 138.25 sa,rms (MPa) 3.0399 3.2479 6.1562 2.5723 ns 6 6 7 6 When the statistical parameters sa,av, sa,rms, and ns are available, probability density function (pdf), f(sa), failure rate function (frf),λ(sa), and cumulative distribution function (cdf), P(sa), for fatigue limit can be expressed as, respectively ( )s rmsa, a ,1, 2 1 )( nCPks sf −' = π ( )                 −' − − rmsa,s ava,a ,1,2 1 exp snCPk ss (7) ( ) ( ) ( )a a a -1 sP sf s =λ (8) ( ) ∫∞ −' = a s rmsa, a ,1, 2 1 )( s nCPks sP π ( ) a 2 rmsa,s ava,a d ,1,2 1 exp s snCPk ss                 −' − − (9) where k'(P, 1-C, ns) is an equivalent factor with respect to the synthetic coefficient, k(P, 1-C, ns), with a consideration of single
The factor and coefficient are defined, respectively ( ) ( ) P CZ nt nCPk 1 1,1, s1 s − +=−' − ; ( ) ( )1 ,1, s1 s −+=− − ntZnCPk CP (10) The probabilistic measurements of fatigue limits at arbitory P-C levels can be evaluated using the equation below ( ) rmsa,s ava, a ,1, snCPkZss P CP −'−=− (11) By the above measurement method, the pdf curves of fatigue limit for the present material are exhibited in Fig. 4.
Online since: June 2010
Authors: Vanessa K. Peterson, Cormac Corr, Gordon J. Kearley, Roderick Boswell, Zunbeltz Izaola
This method does not provide easy alteration to the microstructural and chemical composition of the polymer, factors which affect the PEM performance.
Little work has been reported on transport properties of plasma polymers and substantial research and development is required to make plasma polymer membranes commercially competitive with other available materials produced by wet chemical processes.
In the polymerisation of styrene for fuel-cell membranes, the cross-linking has a strong impact on the membrane performance, increasing the mechanical strength and the chemical stability, and decreasing the swelling and toughness.
Online since: June 2012
Authors: Ming Zhu Liu, Bin Jie Zhao, De Yu Tang, Ke Kuan Wang, Bin Long
Although this method can meet the quality requirements of the pipe surface cleaning, but the construction is extremely inefficient, and not recycled due to the spit of sand feed pipe surface, on-site consumption of sand material, resulting in a large waste of raw materials, and the blasting process dust pollution of the environment, but also affect the health of the operatives [1].
Due to the impact and cutting action of abrasive, the mechanical properties of the pipe surface and the fatigue resistance of the pipeline are improved, and increase the adhesion between the pipe surface and the coating ,and extend the durability of the coating, but also conducive to the flow of paint peaceful decorative rid of impurities on the surface, variegated, and the oxide layer at the same time, so that the media surface roughening, reducing the residual stress of the surface of the substrate, increase the hardness of the substrate surface.
Running for some time in normal working condition, there is not destabilizing factors, the run is also very stable, verify correct to load operating conditions.
Online since: March 2016
Authors: Guo Jin Xu, Yong Jun Li, Xiao Yong Wan, Zhao Chong Ding, Jin Jiang He, Jun Feng Luo
Under the action of magneto mechanical effect, magnetic domain shifted and rotated directionally and irreversibly, and the original disorder magnetic domain became a partially ordered arrangement.
Fig. 7 Effect of thickness on PTF Conclusion Based on the investigation, it shows that magnetic property of ferromagnetic materials is affected by many factors, such as grain orientation, internal stress, dislocation, and thickness.
Liu, The influence of the residual stress on magnetic property of soft magnetic materials, Hangkong Bingqi. (2004) 28-31
Online since: July 2007
Authors: Pete S. Bate, John F. Humphreys, Ian Brough, Haruo Nakamichi
Introduction Many mechanical properties of steels are determined by their deformation and annealing history.
In particular, the grain morphology and texture of interstitial free (IF) steels affect their formability under industrial deformation conditions, such as during automobile manufacture.
From the present results, it is not obvious which factors are most important in determining the sequence of events, and further more detailed investigations are required..
Online since: August 2014
Authors: Wen Qiang Yang, Juan An, Xiao Li Yuan, Wen Tang Xia
You will learn about the extraction of metal from minerals, wastes, and recycled materials, the design of metallic materials that possess desired mechanical, physical and chemical properties, and the production of components from selected metals and alloys [2].
The factors have led to a shortage of qualified teachers of practice teaching.
Some colleges and universities are forced to reduce practice time, compress content and simplify practice method, which greatly affect practice teaching effect.
Online since: April 2021
Authors: S.L. Petukhov, B.P. Saushkin, Yuriy A. Morgunov
Introduction Knowledge-intensive mechanical engineering uses parts with 10...30 μm deep surface understating [1].
The following assumptions are made to model the change in the gas content of the medium carried by a straight-flow conduit: - solid products of electrolysis and changes in temperature do not affect the gas content of the electrolyte; - the electrolyte flow is unidimensional, and the slip ratio is 1; - anode gas emission is an order of magnitude lower than its cathode counterpart.
Neglect thermal effects that have other causes; - the thermophysical properties of the solution do not depend on the temperature; - the flow velocity profile is homogeneous in the cross-section of the channel; - neglect the scatter of energy beyond the system under consideration; - the wall channel temperature does not change over time or length.
Sketch of the cavitation profile and errors caused by a variety of factors General-case analysis shows that the bottom profile error can be presented as a superposition of the errors of surface alignment (non-parallel bottom) and shape (non-flat bottom).
Saushkin, Surface relieves micromachining with application of methods of physicochemical effect on material / Knowledge-Intensive Mechanical Engineering. 2012.
Online since: August 2013
Authors: Hong Lu Bai, Shu Hong Zuo, Li Hong Xiong, Ben Yi Liu, Zhi Min Tian
But the cavity walls constraint masonry construction is suitable in cold area for its high heat-insulating property.
Because the mechanical properties of concrete small hollow block is better, broader scope of application as an alternative to clay brick, and relatively mature and new wall materials, it is widely used in the multi-layer and even in high-rise masonry buildings.
In recent years more and more methods are put forward on the small concrete block wall thermal insulation properties around the world: ultralight ceramic concrete block multi-row hole block wall of the wall, lightweight aggregate concrete, concrete single or dual hole fill put the insulation material block walls, concrete block cavity or composite wall, thermal insulation or insulation concrete block wall, lightweight aggregate concrete block composite wall, which can improve the building enclosure performance effectively.[2] The structure constraints in the concrete block cavity wall brick masonry is focused in this paper, namely composite insulation wall.
Segment BC stiffness reduction factor is 0.4 times of the segment AB according to parameters in literature [1] and [6].
So it’s type, reinforcement, the strength, stiffness, spacing, anchor length inserting into the inside wall and the outside, etc., will directly affect the connection degree of the inside and outside leaf in the wall and the anti-seismic performance of the cavity wall constraint masonry structure.
Online since: June 2008
Authors: Nong Gao
The basic principle of SPD processing is that a very high strain is introduced into materials which achieve significant grain refinement and improve properties of materials.
UFG metals and alloys processed by SPD techniques have superior mechanical properties, such as high strength with good ductility and excellent superplasticity at lower temperature and higher strain rates [4].
It is obvious that the severe shear deformation of TiNi matrix during the ECAE process affected the microstructural revolution.
Several factors influence the DSC results in accuracy, such as sample preparation, testing condition and baseline correction, which should be carefully handled during DSC analysis.
Showing 24581 to 24590 of 26166 items