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Online since: October 2013
Authors: Zhi Tao, Peng Li, Dong Dong Liu, Hong Wu
Corrections Commercial software Simerics was used to get the correction factors of Reynolds number and Mach number, the simplified CFD calculation model is shown in Fig. 2.
Correction factors are derived according to the length and diameter ratio L/D and the ratio of chamfering depth and diameter c/D for chamfered inlet, or the ratio of radiusing dimension and diameter r/D for radiused inlet.
The correction factors of CRL, CRr and CRc in different working conditions are shown in Fig. 8 to 10.
The factors considered in the model is comparable comprehensive, it can simulate laminar flow state with low Reynolds number and complex working conditions of rotation, high mach number flow and supersonic flow.
Journal of mechanical engineering science, 7(2), pp. 210-219.
Online since: December 2023
Authors: Agus Purwanto, Anif Jamaluddin, Muhammad Nur Ikhsanudin, Cornelius Satria Yudha
The dendritic phenomenon is one of the problems in AFLBs that affect the cycle stability of AFLBs.
The cylindrical cell model 18650 is used in this research due to its good mechanical stability applied to batteries for electric vehicles [28].
This research studied the different properties of cathode materials (NMC622 Vs.
Mass Loading of NMC622 as Cathode Material In this study, optimization of mass loading was observed toward the commercialization of AFLIBs that will affect energy density, battery performance [31], and battery fabrication's overall economic factor.
Also, it will affect on the diffusion of lithium ions during the charging/discharging process [33].
Online since: January 2013
Authors: Wei Zhang, Zhi Yuan Niu, Chao Qun Wu, Jin Liang Xu
The physical properties of working fluids at 25oC are shown in Table 1.
From the above analysis, it should be noted that for the similar shapes from top view, the shape from side view could also be different due to the difference in wetting properties.
Note that Fig.2d only shows the possible droplet shapes in static conditions, the actual droplet shape is hard to determine due to the comprehensive influences of wetting properties and viscous drag by fluid flow.
For instance, the flow velocity affects the advancing and receding contact angle, leading to different droplet shapes compared with the static conditions (see Fig.2e).
The droplet shape could be spherical, hemispherical, flattened disk and plug, depending on the specific wetting properties and flow conditions.
Online since: August 2014
Authors: Jun Zhe Ai
Introduction Carbon steel is commonly used because of its low cost and excellent mechanical properties.
The salinity of water is another important factor for it affects the solubility of the gases [2].
Both the strength of adsorption and the inhibition efficiency depend on the structure of organic compounds, the physical and chemical properties of the metal and the corrosive media [14].
This chemical compound has some property against metal corrosion in heterogeneous acidic media, but the inhibition efficiency is relatively low.
Thus, it is important to make it clear what the property of thiazole is.
Online since: February 2010
Authors: A.S. Adavbiele
Adavbiele Department of Mechanical Engineering, Ambrose Alli University, PMB 14, Ekpoma, Nigeria engradavbiele@yahoo.com [Received 1 July 2009, accepted 20 January 2010] Keywords: Second law, exergy, EGM, optimization, thermofluid systems Abstract: This paper presents an overview of the concept of second law applications to all processes of thermofluid systems.
The availability-loss concept allows us to think about entropy generation in terms of the more concrete notion of lost mechanical work.
An understanding of the relations between exergy/EGM and the environment may reveal the underlying fundamental patterns and forces affecting changes in the environment, and help researchers to deal better with environmental damage.
In order to improve the overall system efficiency an appropriate assessment of real achievable economic and exergy factors may then be considered.
PhD thesis, Department of Mechanical Engineering, University of Twente, Netherlands. (1997) Htm.
Online since: May 2011
Authors: Jun Wei, Li Ying Peng, Peng Yu Wu, Teng Wang
Introduction The reinforcement corrosion is one of the most important factors leading to the durability deterioration of concrete member.
The corrosion leads to the deterioration of mechanical property of reinforcement, the longitudinal throughout cracks and even bursting crush or spalling, which influences the carrying capacity and ductility of members[1].
(2)Under the action of rust expansion force, the principle tensile stress at the end of 70mm stirrup spacing specimens was higher than the value of 100mm stirrup spacing specimens, which would affect the location of rust expansion cracks on specimen surface.
is rebar corrosion rate which is converted from the internal pressure in the following formula: (in which, n is filling inflation the value of which is 3 without the influence of concrete porous; and are respectively effective elastic modulus of concrete and Poisson ratio ); is correction factor the value of which is 1 before concrete cracking around the longitudinal reinforcement in consideration of concrete heterogeneity but 2. 3 after cracking.
Online since: July 2013
Authors: A Kumar, Somik Banerjee, M. Deka, Udayan De
Thermal spikes, in addition to affecting reaction rates, also generate large pressures in the rapidly heated material within the spike.
Kohno, Effects of ion irradiation on the mechanical properties of several polymers, Int.
LET dependence on the chemical reactions and change of mechanical properties, Nucl.
Heavier ion irradiation effects on mechanical properties of PE and PTFE, Polymer 37 (1996) 3737-3739
Misra, Grafting: a versatile means to modify polymers Techniques, factors and applications, Prog.
Online since: October 2012
Authors: Mohamad Rusop, A.N. Fadzilah, Dayana Kamaruzaman
Introduction Recently, carbon based thin film such as amorphous carbon, carbon nanotubes, graphene layers, and diamond like carbon has become the best interest due to the excellent mechanical, optical and electrical properties[1].
The difference between σd and σi indicate photoresponse properties of the material where the current flow in the external circuit is generated from the electron-hole pairs that are separated by the electric field between the electrodes from the light absorption (when being illuminated).
The π bonding at sp2 sites forms the conduction and valence bands edges thus this governs the electrical properties of a-C [14].
Thus, since the localized π electrons play an important role in determining the optical properties of a-C, the reduction in Eg can also be said to be due to π- π* transition that comes from the sp2 domains in which electronic wavefunctions delocalised [17].
Fig.1 : The evolution of optical band gap and electrical conductivity at different samples Fig.2 : Tauc’s plot of a-C at different samples The current-voltage (I-V) measurement is one of the methods to estimate the photovoltaic properties of a-C film.
Online since: October 2009
Authors: Akira Kawasaki, Kenta Takagi, Yoshio Harada, Masakazu Okazaki
One of foremost considerations in our project is the evaluation for thermal expansion behavior of each layer which affects the internal thermal stress.
The TBCs generally consist of distinctive porous layers formed by deposition approaches such as thermal sprayings and physical and chemical vapor depositions in order to meet low thermal and elastic properties [1,2].
However, the property of thick coating may not strictly equal to one of actual coating even if they were produced under the same conditions, because the microstructure in the deposited coatings gradually varies along the thick direction.
The free-standing 8YSZ layer was prepared by mechanical removal of the substrate.
However, the densification due to sintering is not influential factor on the change in the CTEs, because no dependency of the CTEs on the shrinkage is found in Fig.6.
Online since: April 2015
Authors: Mohamad Riduwan Ramli, Zulkifli Ahmad, Khairudin Mohamed
Over the past decades, the unique properties of silsesquioxane polymer have been exploited in various electronic applications such as photoresist for lithography [3-4] and optoelectronic devices [5].
The unique properties of HSQ in lithography application are closely related to the silsesquioxane cage structures which could retain the high resolution pattern after curing and developing processes.
Here, Wilkinson’s catalyst was utilized to affect a regioselective hydrosilylation reaction whereby a selective bond formation at only one end of Si-H groups in disiloxane monomer reacted while the other is left intact.
Besides, Karstedt’s was a considerable reactive catalyst as compared to Wilkinson’s [11] and this factor is important in hydrosilylation process involving large molecule compound such as silsesquioxane.
The lithographic properties in term of developing processes were quite good but need further optimisation.
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