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Online since: March 2025
Authors: Tong Xi Zhu, Yan Jun Zhao, Hang Min Guan, Yan Feng
Its special optoelectronic properties make it widely used in various photoelectric devices, such as solar cells, photodetectors, transparent electrodes, and sensors[16, 17].
Xue, Microwave-assisted hydrothermal synthesis, growth mechanism and photocatalytic properties of pancake-like Cd(OH)2 superstructures, Crystengcomm 14(10) (2012) 3495-3500
Kargin, Optical and chiro-optical properties of crystals with sillenite structure, Crystallography Reports 46(2) (2001) 312-335
Rao, Preparation, structural and linear optical properties of zinc sillenite (Bi12.66Zn0.33O19.33) nanocrystals, Journal of Materials Science-Materials in Electronics 24(5) (2013) 1569-1574
Nagarajan, Cd(OH)F: Synthesis, structure, optical and photocatalytic properties, Journal of Fluorine Chemistry 182 (2016) 98-103.
Online since: January 2012
Authors: Takayuki Takasugi, Hiroshi Tsuda, Yasuyuki Kaneno, T. Moronaga
Introduction The single crystal Ni-based superalloys have been widely used for the high temperature structural materials such as gas or jet engine turbine blades to display their highest mechanical performance [1-4].
On the other hand, Ni3X type intermetallic compounds including Ni3Al [5], that are categorized to geometrically close packed (GCP) structure, exhibit high phase and microstructural stabilities up to their melting points because of their low diffusivity, and have very attractive mechanical properties at high temperature.
It was recently shown by the present authors that the two-phase intermetallic alloys composed of Ni3Al and Ni3V (D022 phase) [6-8] improved poor ductility and resulted in superior high temperature mechanical properties to many existing Ni-based superalloys [9].
On the other hand, the specimens with [47] orientation that have the highest Schmid factor in the primary Ni3Al precipitates showed the lowest yield stress at room temperature, as shown in Fig. 1.
Based on this observation, it was demonstrated that the interfaces between primary Ni3Al and the channels (Ni3V) strongly affect the mechanical property (i.e., hardness) and contribute to the strengthening of the two-phase intermetallic alloys.
Online since: April 2021
Authors: Yuriy A. Morgunov, S.L. Petukhov, B.P. Saushkin
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: October 2014
Authors: Tao Chen, Jing Peng Zhu, Ya Ping Hu
Too large clearance may make steel cuttings between shear edges, which affect shearing quality. 1) Modeling of up shear edge The width of shearing rolled piece based on design goal is 700-1400mm, and the length of shearing edge is 1.3 times of width of panel, 1800mm.
Therefore, the mechanical strength should be high to satisfy mechanical motion feature.
Its mechanical property is worse than that of closed rank.
The minimal safety factor 5.4 is greater than the general design standard.
Reference: [1] Johnson R C.Mechanical Design Synthesis with Optimization Applications, Van Nostrand Reinhold Company,1971
Online since: August 2013
Authors: Guang Hui Zhang
Introduction It is shown by a number of seismic surveys that due to economic backwardness, disqualified construction material, traditional building structure adverse to seismic resistance, and lack of knowledge about seismic resistance, current rural buildings in China are seldom fortified against earthquake, or poorly fortified, resulting in the situation that under the same failure condition of seismic intensity, the seriousness of casualties and building collapse in rural area is much higher than that in urban area, and the poorer the region is, the more seriously it is affected.
Their basic principle of sliding isolation can be analyzed successively based on general mechanical relationship.
Reflected by the general mechanical relationship, it is certainly impossible to establish direct correspondence between the acceleration measured in test and the actual friction.
Zhu Jungao et al. firstly put forward the concept of foundation isolation; Liu Xiaoli et al. conducted study on the impact of gravel cushion thickness and base pressure on the ground seismic response; Dou Mingyuan, Zhao Shaowei, Liu Darong et al. researched the impact of such factors as cushion thickness and particle size on the performance of seismic isolation through the shaking table test of gravel cushion.
Mao Shangli et al. think stratified layer can be formed at building base through replacement of sand, and the seismic wave will be reflected and refracted by the media of upper and lower soil foundation interfaces of different mechanical properties; such resilient interfaces don’t only change the geometric path of wave propagation, but will redistribute the energy of wave field.
Online since: January 2012
Authors: Marziyeh Hassani Doughabadi, Farhad Kolahan
This combinatorial explosion on GA factors and its values makes it extremely difficult to evaluate the effects of parameters settings on GA performance.
This property makes exact algorithms based on enumeration, extremely time consuming and inefficient.
The selected designed matrix is a standard central composite rotatable four-factor five-level factorial design with 31 experiments.
For any parameter, larger t-value and smaller P-value indicate that the factor is very significant.
As indicated in Table III, the most important parameter affecting GA's solution quality is the probability of mutation (Pm).
Online since: July 2021
Authors: Jyoti Prasad Gogoi, Pankaj Bora, Utpaljyoti Mahanta, Jayanta Kumar Sarmah
It has been reported that the irregular particles have larger conduction losses due to large surface area, consequently affects the microwave absorbing properties [4].
Wu, “Absorption properties of carbon black/silicon carbide microwave absorbers,” Composites: Part B, vol. 42, pp. 326–329, 2011
Jiao, “Li Storage Properties of Disordered GrapheneNanosheets,” Chem.
Hahn, “Microwave properties of graphite nanoplatelet/epoxy composites,” J.
Huanga, “The electromagnetic characteristics and absorbing properties of multi-walled carbon nanotubes filled with Er2O3 nanoparticles as microwave absorbers,” Mater.
Online since: November 2014
Authors: S.K. Tripathi, Ramneek Kaur, Mamta Rani
Optical Properties 2.1.2.
Electronic Properties 2.2.
In this method, the main reason of alteration in different thermal, mechanical and other properties is due to increase in surface to volume ratio.
Oxide nanomaterials can lead to advanced ceramics that exhibit superior corrosion/oxidation resistance, mechanical, thermal, optical, electrical, or magnetic properties.
But the higher density of transistors increases the problem of heat generation, thus affecting the functioning of the devices.
Online since: February 2022
Authors: Oleg V. Kudryakov, Valery N. Varavka, Igor V. Kolesnikov
A wide range of experimental data obtained in the field of studying the structure and properties of nanocomposite ion-plasma coatings made it possible to generalize and systematize the characteristic features of coatings of various cermet systems [8-12].
And secondly, spiral steps in reality can have a greater height than the Burgers vector, that is, h > b, which affects the calculation results through a parameter d.
Taking into account these factors and the satisfactory agreement of the obtained calculation results with the experimental results, we can talk about an adequately chosen theoretical approach and the viability of the calculation model.
Kharanzhevsky, The tribological properties of superhard and functional coatings based on carbide and boron nitride, Journal of Friction and Wear. 40(6) (2019) 776-782
Morozkin, Researching the properties of nanocomposite coatings by the methods of indent-diagnostics, in I.A.
Online since: January 2010
Authors: Alexander Grüning, Markus Lebsanft, Berthold Scholtes
Lifetime of hot-work tool steels is often limited by the development of crack nets as a consequence of thermal or mechanical fatigue loading.
Thermal fatigue loading is one of the most important factor related to the lifetime and damage of tools for extrusion, die-casting and injection moulding as well as for many other hot working tools [1-3].
The mechanical properties at room temperature were: Rp0.2 = 1153MPa, UTS = 1384MPa.
A very important indicator to assess the consequences of thermo-mechanical fatigue processes at total strain controlled experiments is the resulting plastic strain amplitude.
Lacki: A Study of Thermo-mechanical Load of the Forging Dies.
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