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Online since: August 2021
Authors: Yi Xin Yan
Combining segments with various chiral properties can produce seeds with additive chiral properties illustrated in Fig. 5c.
There are numerous factors that affect their catalytic efficiency, such as ambient temperature, pressure, etc.
Different surfactants have different sensitivity to the structure of SWCNTs due to their specific physicochemical properties.
During the early day of carbon nanotube research, this approach based on the intrinsic properties of nanotubes has been adopted.
This characteristics with different bandgaps affect electronic properties.
Online since: July 2015
Authors: Ramadhansyah Putra Jaya, Norul Ernida Zainal Abidin, Ahmad Farhan Hamzah, Mohd Haziman Wan Ibrahim, Norwati Jamaluddin
Therefore, the usage of fly ash in SCC minimizes superplasticizer dosage and used in concrete without affecting the concrete workability and slump flow.
The mechanical properties (compressive, split and flexure) of silica fume reported significant performance with higher compressive strengths.
[6] Domone, P., A review of the hardened mechanical properties of self-compacting concrete.
Bartos, Permeation properties of self-compacting concrete.
[32] Ahmadi, M., et al., Development of mechanical properties of self compacting concrete contain rice husk ash.
Online since: May 2020
Authors: Martin Sahul, Marián Haršáni, Tomáš Vopát, Tomáš Zlámal, Ondrej Vortel
Introduction The coating-substrate adhesion strength, hardness of coated cutting tools and cleaning of the substrate before deposition are very important factors for producing the performing cutting tools [1].
The coating adhesion is strongly affected by process of plasma pre-treatment [4][5].
In the work [6], the mechanical properties and the high temperature oxidation resistance of Ti–B–Si coatings with various Si amounts were investigated.
The effect of coating deposition parameters on the mechanical properties of CrAlSiN thin coatings are discussed in [16][11].
SEM images of the Rockwell-C indents and evaluation of coating-substrate adhesion on cemented carbide cutting inserts prepared by wet microblasting Conclusion This article state that bias voltage affected the properties of the series of AlCrSiN nanocomposite hard coating.
Online since: March 2014
Authors: Bao Rang Li, Chuang Feng Zhao, Kang Hua Yan, Dong Yu Liu, Zhi Wei Yang
Introduction The morphology-controlled synthesis of inorganic oxides has attracted considerable interest because of their unique morphology-dependent properties and applications.
Actually, many factors, such as formation energetics, growth kinetics, as well as environmental condition play an important role in determining the formation mechanism and growth morphology of a particular phase.
These studies related to the synthesis mechanism with controlled Lu2Ti2O7 morphologies would become valuable because the octahedron-shaped Lu2Ti2O7 might have a potential effect upon its physical properties although till now no similar investigations were found to be reported.
From the viewpoints of thermal dynamics, particle morphologies should be strongly affected by lattice energy in crystallites and surface energy of the exposed surface.
This might be another factor which contributes to the reduction of pH sensitivity value.
Online since: June 2014
Authors: Oliver Döbrich, Paul Matthäi, Chokri Cherif
This causes defects like gaps and fish-eyes which affect the load-bearing properties and creates weak area in the structure by inclusions of resin [2], shown in figure 3.
Figure 1: Left: Schematically principle of novel technology for yarnless layer binding by adhesives, Right: Sample pattern plan [2] Technology Development The binding of layers with a suitable adhesive system require an understanding of the bonding process, application technology and the surface properties of adhesives and fiber.
Besides, process stability, durability and maintenance form a decisive factor in the selection of this technology.
At this point of research, data about the mechanical behavior are still pending.
To gain knowledge about effects that occur while forming a textile structure with the introduced properties, a large dimensional model will be assembled.
Online since: May 2016
Authors: Wun Kai Wang, Hsuan Liang Lin
The objective of this study is to investigate the effects of activating fluxes on the weld bead geometry, hot cracking susceptibility and mechanical property of A356 and 6061 aluminum alloy dissimilar welds in the gas metal arc (GMA) welding process.
The weld bead geometry of welds plays an important role in determining the mechanical properties of the welding specimens.
The purpose of second stage is to investigate the effect of activating flux on the hot cracking susceptibility and mechanical property of A356 and 6061 aluminum alloy dissimilar welds.
Effect of Activating Flux on Mechanical Property of GMA Welds.
Fig. 8 shows the comparison of the mechanical property of conventional welds and GMA welds made with four single-component fluxes.
Online since: December 2006
Authors: Dong Ying Ju, Wei Min Zhang, Ryuji Mukai, Y. Matsumoto
Strain due to phase transformation, transformation plasticity and thermal expansion are the dominant factors that need to be included in the simulation of a quenching process.
Introduction In order to obtain improved mechanical properties and fatigue strength of machine components, such as gears, shafts and so on, a carburizing-quenching process as a method of surface hardening is often used in industry.
In quenching process, strain is caused by phase transformation and transformation plasticity and thermal expansion, which are important factors to be able to predict and simulate deformation after quenching.
Summary of theoretical modeling In a quenching process, the effects of metallic structures and stress/strain and temperature are intertwined affect one another.
Of Materials and Heat Treatment, Vol. 25, No.5, Chinese Mechanical Engineering, pp.28-34(2004).
Online since: May 2013
Authors: Cheng Fan
However, due to the brittle performance of ceramics, porcelain fracture and spalling fracture were often occurred and the use of all-ceramic restorations was greatly affected.
In 1886 Land CH reported the first case of all-ceramic crown restorations[1], which is valued for the good aesthetic characteristics, but the strength and toughness of ceramics is not enough and can not meet clinical practice needs. 1962, Weinstein et al [2] invented the porcelain with frit metal technology, which combines the strength of the metal basement structure and the aesthetics properties of the porcelain, to manufacture the metal-ceramic crown restorations which has certain aesthetic effect, this technology now is mature and has been widely used in the oral rehabilitation fabrication.
Meanwhile, the metal ions of the ceramic alloy not only make the porcelain prosthesis occurred fade, and some patients have metal allergies [3], the existence of these factors impels the development of the all-ceramic systems without metal basement structure.
However, the brittleness of the ceramic restoration is still the Achilles heel of restricting its application, greatly influence the reliability and stability of the material properties, also limit its features to play and practical application.
The main mechanical properties of all ceramic crown and crack germination, extension, penetrating and failure process was simulated in this paper and the results has important guiding significance for the clinical use of all-ceramic crown restoration.
Online since: February 2006
Authors: Philippe Bocher, Muhammad A. Arafin, Mamoun Medraj, Daniel P. Turner
However, because of their susceptibility to heat affected zone cracking during welding [1], transient liquid phase bonding evolved as an effective way to join these superalloys.
For the Inconel 625/BNi-2 combination, the values of activation energy and frequency factor for diffusion of boron into the base alloy were found to be 211 kJ/mol and 0.033 m 2s-1, respectively.
The values of activation energy and frequency factor were found to be 203 kJ/mol and 0.0159 m 2s-1, respectively.
Therefore, the solid solution that forms at the end of holding period, in the region close to the joint interface, has a significant higher concentration of chromium than that of the center and, it will result into a change of mechanical properties across the joint. 0 20 40 60 80 100 120 140 0 20 40 60 80 100 Holding Time (min) M axim um Brazing Clearances (µm ) 1325K 1358K 1394K 0 20 40 60 80 100 120 140 0 20 40 60 80 100 120 Holding Time (min) M axim u m B raz in g C learan ce (µ m ) 1325K 1358K 1394K (a) (b) (d) (c) Fig. 4 Composition of (a) boron and (b) chromium in the Inconel 625/BNi-2 joint bonded at 1325K for 50 minutes.
The obtained activation energies and frequency factors for diffusion of boron can also be used to determine the isothermal solidification times during TLP bonding of Inconel 625 and 718 base alloy with any nickel based filler alloy that contains boron as melting point depressant.
Online since: May 2023
Authors: Muhammad Ammar Imran Mohamad Razki, Nor Fazli Adull Manan, Mohd Asri Mohd Nor
Consequently, when the frost accumulates, the wall temperature decreases, thus affecting LNG vaporization performance.
Researchers also found that temperature and humidity of the ambient air are a few main factors that affect the heat transfer performance of an AAV.
On the other hand, due to lower thermal conductivity, the frost formation on the AAV surface is developed and increases the thermal resistance to heat transfer, thus affecting the heat transfer.
Ren et.al. [15] simulated a numerical model to examine the heat transfer properties of LNG and evaluate operating pressures, temperatures, and velocities of the heat transfer coefficient.
Min, ‘Modeling of frost growth and frost properties with airflow over a flat plate’, Int.
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