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Online since: January 2014
Authors: Xiao Wang, Ru Ru Zhu, Xiao Yu Chang, Zhuan Zhuan Li
Previous investigation indicated that the compound flame retardants can improve the flame retardancy of asphalt binder and cannot affect other desirable properties due to the synergistically efficient of flame retardants [3].
Asphalt aging is one of the principal factors causing the deterioration of asphalt pavements.
Dynamic shear properties were measured with a dynamic shear rheometer (DSR, MCR 101, Anton Paar Co.
Fig.1 Effect of PAV aging on LOI Fig. 2 Effect of UV aging time on LOI Dynamic Shear Properties.
The results indicate that UV aging makes the mechanical properties of the asphalt more solid-like and the changes are dependent on aging time.
Online since: August 2013
Authors: Jian Xiong Liu, Jiang Wei, Yu Chun Dang, Kun Xu, Yi Zhou
The main reasons that limit the performance of TiO2 electrode is its low real capacity which caused by poor conductivity and other factors.
The primary research of LIBs currently is improving the properties of electrode materials.
Many scientists have adopted these forms of material to use in batteries and test the electrochemical properties, the results showed large capacity over 230mAh/g [26-29].
Graphene is a 2-D sheet of carbon atoms with a honeycomb structure which excellent electronic conductivity and mechanical properties.
Vol. 21 (2011), p. 1717 [23] C.A.Grimes, G.k.Mor.: TiO2 Nanotube Arrays Synthesis, Properties and Applications (Springer, Germany 2009)
Online since: August 2023
Authors: Hari Arief Dharmawan, Syifa Syauqiyah, Masruroh Masruroh, Dionysius J.D.H. Santjojo
Hydroxyapatite biomaterials are considered capable of replacing bone tissue minerals due to their chemical and structural properties, which are similar to the inorganic components in the bone so that they can replace calcium (Ca) and phosphorus (P) content [2].
According to research from Mohamed et al. [6], several parameters in the printing process affect the quality and mechanical results of extrusion, including model concepts, material comparisons, machine parameters, environmental factors, direction of machine movement, and work parameters.
Therefore, research is needed to determine other factors that affect the quality and dimensions of the printing results.
Its mechanical subsystem was constructed from a syringe and a non-captive stepper motor driving the syringe's plunger.
The effect of nozzle size also affects the response of the filament.
Online since: July 2011
Authors: Li Wang, Zi Yu Zhao, Bi Bo Xia, Su Zhi Zhang
Simulation Analysis of Splat Deposition in Plasma Spray Forming Ziyu Zhao1,a, Bibo Xiao1,b, Suzhi Zhang1,c and Li Wang1,d 1College of Mechanical Engineering and Automation, Huaqiao University, Xiamen, Fujian, 361021, China azyzhao@hqu.edu.cn, bxiaobibo@hqu.edu.cn, czhangzhs@hqu.edu.cn, dhuyana88@163.com Keywords: Numerical Simulation, Flattened Particle, Plasma Spray Forming.
Flatten behavior of a single Ni droplet falling on a smooth substrate is evaluated by numerical simulation of ANSYS software, this paper meanwhile researches a single Ni particle deposition in the surface of flattened Al2O3 sheet and thin Al particles, the impact factors of particles flattening and the mechanism of the interaction between particles are also studied.
Dynamic spreading of a single plasma spray droplet in forming process directly affect the quality of the coating, because of small size and high speed, observation of real-time tracking a single droplet flattening through the experimental measurement is very difficult, so numerical simulation methods have became research approach for many scholars.
Harlow using MAC (mark-and-cell) finite difference method, for the first time simulated the process of droplet splashing in the plate, whose research ignored the surface tension and impact of viscous dissipation [1]; Madejski studied theory on the flattening and cooling heat transfer behavior of molten metal droplets colliding with the cold substrate [2]; Mostaghimi considered that after the collision the rapid cooling layer has a significant effect on the course of flattening by numerical simulation [3]; Xiangyang thought the adsorptive material of the base surfaces is a major factor leading to the particle crushing in the collision [4]; Through observing the microstructure of nickel flattening particle, Fukumoto concluded that splash was due to the rapid flow of droplets [5].
The results showed that after the particle collide with the substrate, it spread evenly around along the contact surface, height decreases and diameter increases, finally tending to pancake-like, but splashing and broken may occur due to the high impact velocity; high-speed droplet particles spread in the deposition surface of the splat shows that for the random of deposition particles before and after, surface becomes rough, which have a very significant impact on the degree and shape of subsequent droplet dispersing and formation and distribution of sprayed layer pores, it will direct effects finally generated microstructure of sprayed layer and bond strength or other macro-mechanical properties.
Online since: February 2008
Authors: Qing Li, Wei Li, Chaiy Rungsiyakull, Richard Appleyard, Michael Swain
One of most important factors to determine the clinical success of implantation consists in osseointegration that is defined as 'direct structural and functional connection between ordered living bone and the surface of a load-bearing implant'[1].
However, it still remains unclear how the implant biomaterials and corresponding surface morphologies would affect the osseointegration.
It is suggested that the microstructure and/or micro-morphology of the sub-surface and coated surface could largely affect the rate of bone adaptation to the implant surface [4].
Initially, a mechanical load of 200N [6] was applied on top of the crown at a 2 mm offset from the centre to the buccal side of the macro-scale model.
The corresponding elastic properties such as Young's modulus and Poisson ratio were determined from values obtained from the literature [2, 7, 8].
Online since: February 2007
Authors: R. Mishra, Govind P. Kothiyal, B.I. Sharma, Madhumita Goswami, J.V. Yakhmi
Introduction The wide applications of glass-ceramics in various disciplines of science and technology are as a result of their superior thermal, mechanical and electrical properties [1- 3].
A number of studies related to mechanical, electrical and thermal properties of this material have shown that among others, crystal morphology/crystallinity factor governs the different properties [7-12].
We report here the preparation of magnesium aluminum silicate (MAS) glass-ceramics and study of the effect of alumina content on their dielectric properties.
It is seen that the presence of different crystalline phases with different microstructure depending upon the concentration of alumina have marked effect on the dielectric properties.
The sample having pure fluorophlogopite phase responsible for machinability shows low dissipation factor and is less affected by temperature.
Online since: March 2015
Authors: Marion Merklein, Daniel Wortberg, Alexander Kahrimanidis
The dissolution of co-clusters in AlMgSi-alloys by a short term heat treatment can be used to locally adjust the mechanical properties of a blank for a following forming operation.
The concept is based on a local, short term heat treatment by which the mechanical properties of the material are adjusted for subsequent forming steps.
Thus, to fully benefit from the tailored mechanical properties forming should be performed as close as possible to the heating step.
In addition also inherent properties such as alloy composition, type and amount of solutes and dislocation density are reported to affect the PLC effect [9].
Conclusion and Outlook Various influence factors on the PLC effect of AlMgSi-THTB have been investigated.
Online since: June 2012
Authors: Vadim Migunov, Zi An Li, Marina Spasova, Michael Farle
We report electron transport properties of iron filled multiwalled carbon nanotubes (MWCNT) with outer diameters of 30 to 80 nm and lengths of 1 to 10 μm.
Physical properties of MWCNTs are strongly influenced by structural and surface particularities like wall defects and surface adsorbates for instance.
We conclude here that the conductivity of the carbon shells is affected by the core heating and iron diffusion processes.
Conductance of a tube after the iron vanishing increases by the factor of 2.
Schneider, Synthesis and properties of filled carbon nanotubes, Diamond Relat.
Online since: August 2012
Authors: Gelmires Araújo Neves, Romualdo Rodrigues Menezes, Jozilene de Souza, João Batista Queiroz de Carvalho, Izabelle Marie Trindade Bezerra, Suélen Silva Figueiredo
The physical and mechanical properties were determined by water absorption, density in the hardened mortar and compressive strength, for curing periods of 28, 63 and 91 days in a humid chamber with 100% of relative humidity.
Some researchers [6,7] found that the particle size of the ash also affects the mechanical strength of mortars, indicating that the thinness of the material has great influence on the reactivity of the material.
After molding, the specimens were placed in an environment with 100% relative humidity for periods of 28, 63 and 91 days of cure for the development of cementing properties.
All values obtained for both, reference specimens and to the incorporated with rice husk ash, are in accordance with NBR 13281 [12], confirming the possibility to use husk ash in mortars to improve mechanical properties.
One of the factors that provides an increase in the resistance to compressive of mortars is the improvement in the transition zone, because with the use of silica fume there is a decrease in the amount of crystals resulting from the calcium, the empty spaces and the increase of adhesion cement paste and aggregate [13].
Online since: July 2006
Authors: M. Ilavsky, H. Valentova, Z. Sedlakova, V. Velychko, J. Nedbal
Such two-phase structure usually improves their mechanical and ultimate properties.
Investigation of synthesis and physical properties of mainchain LCPUs prepared from LC diisocyanates and/or LC diols by polyaddition reaction have been reported in literature [4-8].
In order to get the LC properties, Finkelmann et al. [9] have suggested that it is necessary to decouple the main chain motion from the mesogenic group by a long flexible spacer.
Most complex thermal properties were found for polymers based on D4 diol; e.g. for D4/TDI polymer two LC transitions were detected. b) Dynamic mechanical measurements during the curing reaction of three component systems show that the power-law parameters, which characterize the critical gel (CG) state (gel strength S and relaxation exponent n), depend on the initial composition and used triol.
Ferry: Viscoelastic Properties of Polymers, 3 rd ed.
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