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Online since: November 2006
Authors: Clodomiro Alves Jr., T.M.P. Frota, R.A. Brito, V. Hajek
The aluminum bronze is one of the most wanted due its excellent properties in combination with low cost of the raw materials.
Introduction Sintered aluminum bronze is a porous metal material, which due both the low cost of the raw materials and very interesting properties (such as higher mechanical strength, heat, corrosion and oxidation resistance in comparison to tin bronzes) is one of the most wanted systems for preparation of filters and autolubricating sleeves for sliding bearing [1].
Outside of the porosity factor these porous metal materials possess excellent mechanical properties, good thermal conductivity, shock resistance and relatively low friction coefficient etc. [5].
Outside of the isothermal sintering temperature, very important process factor is heating rate.
Before each treatment, the system was pumped down by a two-stage mechanical pump until a residual pressure below 10 Pa was reached.
Online since: March 2016
Authors: Chang Chun Ge, Biao Guo, Sui Cai Zhang, Yi Xu, Qiu Yan Lu
In this process, the complex flow and densification processes of sintered material are both significantly influenced by many factors such as strain, strain rate, and forming temperature and should be clarified and precisely controlled [4-6].
In addition, the deformation temperature and strain rate also strongly affect the flow behaviours of the sintered steel.
Ilia, The effect of copper precipitation on mechanical properties at operating temperature of the materials used to manufacture powder forged connecting rods, The 2014 Powder Metallurgy World Congress & Exhibition, Orlando, United States, 2014, May, 18-22
Danilenko, Effect of fine structure on mechanical properties of hot-forged powder steels, Powder Metall.
Varol, Investigation of fatigue properties of shot peened and plasma nitrocarburized P/M FC0205 steel, J.
Online since: November 2014
Authors: Yi Wang Bao, Peng Fei Huang
To date, significant research activities have been carried out around the world, especially in North America, focusing on both fresh and mature properties of SCC.
Equivalent damping factor, he.
Fig.2: Illustration of equivalent damping factor.
The degradation of mechanical properties of frame, such as the energy dissipation capability, ductility, strength and stiffness, could be reflected by the skeleton curve.
The rheological properties of cement and cement– mortar– stone, Physics. (1933) 88–96
Online since: September 2011
Authors: Xue Zhi Yang, Yong Zhang, Jun Ye Zhong, Jin Hu
The analysis show that under the normal and the earthquake conditions (excluding the rock mass damage and mechanical parameters decrese resulted from the lasting earthquake), The Daliushu Dam Site and the right dam abutment are still stable when the safety factor is assumed to be 0.802 under the lasting earthquake.
As for the effect of the strong earthquake, the rock has been done on the handling (eg, grouting, etc.) the rock will break again (destruction), the breaking of the rock in dam site during the earthquake, seismic moment of rock rupture, attenuation of mechanical properties and pore water pressure, the stability of rock mass under the hydrodynamic pressure superimposed, the relative information about the above research has not been found.
The aquifer is mainly affected by precipitation recharge and lateral groundwater recharge areas, lack of supply sources, indicating a greater depth of groundwater, and fluctuates with the seasons, water steep, slow runoff, water quality is poor.
At the normal high water level in the future, and the weak layer will have a softening and mud cavitation phenomenon due to moistureladen, and it’s mechanical property will be reduced obviously.
Which shows that in stability evaluation of rock in the meizoseismal area, we should not only consider the seismic forces, but also consider the larger reduction of parameters of rock structure and rock mechanics after the destruction of instant rock mass, and the significant reduction of stability of rock mass under the effect of continual earthquake and some other factors.
Online since: November 2021
Authors: Wassana Wichai, Surachai Dechkunakorn, Niwat Anuwongnukroh, Pornpen Tantivitayakul, Phetladda Pannak Whitis, Nattakan Traitanon, Primana Punnakitikashem
Interproximal cleaning is an important form of oral self-care habits, considering such areas of the dentition are easily affected by caries.
AuNPs have many interesting properties, such as ease of preparation and modification, biocompatible, and nontoxic to human cells.[10,11] Previous study showed that small-sized AuNPs (22-52 nm) have an increase likelihood to penetrate through bacterial cell membrane.
This also can be described that the particle size and surface charge are ones of the important factors to improve the antibacterial property of nanomaterials.[23] The smaller particles with the larger surface area can adhere more to bacterial membrane, thus inhibiting bacterial growth.[24] As regarding incorporated dental floss, previous studies reported the fluoride impregnated dental floss by Chaet et al.[25] and Keene et al.[26] but there have been no report involving nanoparticles impregnated dental floss.
Further study could focus on associated toxicity, comparison with physical and mechanical properties to similar products in the market.
This information can serve for future development of dental floss product with antimicrobial properties and mechanical properties.
Online since: January 2022
Authors: Pavan Chandrasekar, Dhanya Sathyan, Anjala Nourin, Addepalli Sri Naga Bhushana Aravind Gupta, Bavineni Venkata Jyoshna
The rheological parameters are affected by temperature, stress conditions and several other factors.
The properties of fresh concrete are determined from the rheology.
When dealing with the rheology of fresh concrete; the key factors which measure the appropriateness of concrete mix; stability, mobility and compatibility are the parameters to be considered.
Modelling of rheological properties 5.1.
Studies on rheological properties of super plasticized PPC paste. 
Online since: April 2012
Authors: H. Woźnica, A. Tomaszewska, Rafał Michalik
Zn-Al-Cu alloys are characterized by a number of beneficial properties that include good castability, good tribological properties and low energy input for forming the product.
Properties of Zn-Al-Cu can be improved by the partial or total replacement of copper with silicon and rare earth element additions.
Zn-Al-Cu alloys are characterized by very good tribological properties: high abrasion and adhesion wear resistance, dry friction resistance and low friction factor at high loads [2,3].
The mechanical strength and hardness of Zn-Al-Cu alloys are higher than those for the bronzes.
The presence of rare earth elements, therefore, positively affects the homogeneity of the Zn22Al2CuSiM alloy.
Online since: September 2013
Authors: Jian Min Su, Rui Feng Ding, Kang Tao Hu
Meanwhile it is affected by the size distribution of the fed coal [9].
Fig. 7 Carbon content (Wc.ash) of different granularity in fly ash under variable working condition Fig. 8 Service power rate vs. the load of CFB boiler Above all, we can conclude: 1) the fly ash has different size distribution, and its carbon content is related with many factors, such as the coal property and separator efficiency. 2) the carbon content of fly ash when burning Fujian anthracite is relatively high, so replacing the anthracite by Shenhua bituminous coal is meaningful.
In calculating the boiler efficiency using back balanced method, the heat loss due to exhaust gas, chemical incomplete reaction, mechanical incomplete reaction, the slagging and so on should be deducted [12].
The fly ash carbon content and flue gas temperature are the main factors.
Different coal properties lead to different combustion status and different carbon content in fly ash.
Online since: June 2012
Authors: Yong Xiang Zhao, Z. He, B. Yang
The equivalent stress intensity factor method should be a representative work for well solving the relative engineering structure analysis [4-7].
Railway axle is an important component affecting vehicle’s dynamic behaviour and the transportation safety.
The material fatigue properties play a key role for the safety assessment.
Monotonic mechanical properties at room temperature are 705 MPa ultimate strength, 385 MPa 0.2% proof strength, 25 % elongation, and 50 % reduction of area.
Miller and E.R. de los Rios: The behaviour of short fatigue cracks (EGF Publication 1, Mechanical Engineering Publications, London 1986) [3] R.O.
Online since: December 2012
Authors: Xiao Hua Geng, Liu Yuan, Xiu Mei Mo
Besides, various potential therapeutic agents, such as drugs [4], cells [5], and growth factors [6], could be incorporated by simple pre-mixing.
Which means the ultimately formed ODex/MGel hydrogel was dominated by elastic properties and limited energy can be stored by viscous deformation.
This fact demonstrated that the ultimately formed semi-IPNs hydrogels shows both elastic properties and considerable viscous properties.
The swelling characteristics of hydrogel networks are important in various applications as it affect solute diffusion, surface properties, and mechanical properties.
Fig.3 Swelling properties of ODex/MGel hydrogels and semi-IPNs hydrogels Adhesive and spread of MC3T3-E1 cells on hydrogels.
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