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Online since: January 2016
Authors: Z. Zarina, Mohd Jamir Mohd Ridzuan, K. Azduwin, Anis Atikah Ahmad
From the study, it was found that the addition of microwave absorber had significant effects on the yields and properties of the final products.
The value for all three parameters has only a slightly different and shows for acidic properties of bio oil.
Some factors might affect the chemical composition of bio-oil such as biomass feedstock type, pyrolysis parameters (residence time, pressure, temperature, gaseous environment heating rate), pre-treatment process, and also condensation and vapour filtration (condensing method and medium, filter type, cooling rate).
As a result, the fuel properties of different bio-oils usually vary in wide ranges.
Generally, pH analysis has shown for acidic properties of bio oil produced.
Online since: September 2011
Authors: Jun Bo Wang, Chuan Zhao, Isao Tabata, Teruo Hori
Introduction In recent years, studies have found that new properties of polymers may be generated by doping functional molecules or compound e.g., dye molecules, and drug molecules into the polymers.
Many research groups observed that incorporating the fluorescent dyes into POFs, resulted in highly efficient lasing properties and optical parametric amplification.
Incorporation of functional molecules into the polymer material imparts various distinctive properties [7].
The methanol used for modifying the solubility properties of CO2 fluids is in guaranteed-grade reagent form and was used without further purification.
All these factors contribute in the increase of the intermolecular forces between rhodamine and carbon dioxide molecules, and promote the dissolution of rhodamine in scCO2.
Online since: January 2013
Authors: Ying Min Li, Li Ping Liu, Gui Zhen Wang
(a)Rolling Stones and collapse caused road damage in Beichuan County (b)Landslide buried a road in Beichuan County Fig.4 Damage of road Water, oil, gas supply system In Wenchuan earthquake, due to hit power failures, damage of electrical and mechanical equipment, building (structures) damage, damage to pipelines, water supply hit most cities can not be normal.
Rescuers braved aftershocks, the danger of flying stone cave, 14 to reach all affected counties, 15 have reached all affected villages and towns.
The affected areas are not disaster-related outbreaks of infectious diseases and public health emergencies.
Timely implementation of the schools of the disaster, business recovery capacity to reassure the public, three months after the earthquake, all the affected schools will resume classes, 93% of the affected enterprises to resume production, 93% of commercial outlets resumed operations.
Sufficiency of technology The reason why such a huge loss of life and property caused by earthquake, in addition to the strong earthquakes and other objective factors, to some extent also reflects the backwardness of the Chinese economy, science and technology level is not high and the people in the face of natural disasters, less able to help themselves.
Online since: May 2014
Authors: I. Ismail, Syarifah Nur Aqida
From the compression stress-strain results, carrier fluid viscosity was significant to vary the MR fluid properties.
Introduction Magnetorheological (MR) fluid is a suspension of micron-size magnetisable particles dispersed in a viscous medium with controllable rheological properties.
Their findings show that the MR fluid under squeeze mode exhibit different performance under different materials properties and squeezing parameters.
Among the factors which affect the separation phenomena were, viscosity, particle size, squeezing speed and applied magnetics/electric field [5].
The predicted factors-response relationships from the models are given by the following equations.
Online since: December 2011
Authors: Jian Su, Hai Bin Gong, Dong Lin Zhang, Li Wang, Xing Yu Wang
Based on the load time history acquired by track spectrum, combined with finite element model of exciting beam and material properties, the fatigue life of exciting beam is predicted by Miner cumulative damage rule method in this paper.
The transmission system is an important component of the high speed train, and its reliability directly affects the whole vehicle performance.
The advantage of this method is that it's fatigue damage and material properties are intrinsically linked.
Fatigue life calculation formula is presented as follows: (4) Where, nij is one stress amplitude cycle number under a certain load spectrum, Nij is the determined corresponding fatigue life of one certain stress based S-N curve and Goodman diagram of excitation beam, j is cycle number of species, i is species number of loads, a is damage correction factor and set a=0.68, N is fatigue life of weak point.
Song, Mechanical & Electrical Engineering Magazine, Vol. 19 (2002), p. 8 [3] H.Y.
Online since: July 2014
Authors: S. Suresh, A. Dominic, V.S. Devah Dhanush, J. Sarangan
The lower boundary layer was affected more significantly than the upper boundary layer for APG but the effect was almost similar for FPG.
Pressure Drop and Friction factor The Figs. 3 and 4 show the variation of apparent pressure drop and apparent friction factor of DSM channels and SM channels as a function of Reynolds Number.
This was due to an increase in physical properties of nanofluids over DI water.
This increase in friction factor led to an increase in heat transfer rate in the turbulent regime.
· Pressure drop and friction factor of DSM channel was 17% to 23% lesser than SM channel
Online since: January 2012
Authors: Li Hong Lu, De Jiu Shen, Jing Wu Zhang, Chang Hong Guo
School of Mechanical Engineering, Yanshan University, Qinhuangdao 066004, P.R.
It can be employed to produce thick (e.g. 50–150μm), hard ceramic coatings, with improved thermo-mechanical, wear and corrosion resistance properties compared with conventional anodizing technique [4-8].
When the NaCl concentration is lower than 10% in solutions, it doesn’t affect the concentration of dissolved oxygen in the solutions, so it doesn’t restrict the cathode reaction.
Although the Cl- is enough in solutions, it is not the control effect factors.
▲:PEO samples ■: 45# steel samples Conclusions The conclusions from the properties investigation of the ceramic coatings are as follows: (1) There are many micro-pores in the micro-arc oxidation ceramic coatings, which result in the discharge channels all over the ceramic coatings
Online since: September 2016
Authors: Xu Chen, Yong Wang, You Gang Peng
The subsequent cyclic behaviors of the pre-strained materials are greatly affected.
The effect of pre-strain on material properties in many aspects (mechanical characteristics [1], cyclic hardening/softening [2], ratcheting [3], microstructure [4], crack initiation [5], fatigue properties [6]) of materials has been widely investigated.
For robust simulation of ratcheting strain in our cases, the aforementioned factors should be considered in the constitutive rules.
Lee, Effect of pre-straining on low-temperature mechanical behavior of AISI 304L, Materials Science and Engineering: A, 543 (2012) 50-57
Online since: May 2012
Authors: Yan Ru Zhao, Xiao Yan He, Ming Bao Gao
It has good mechanical properties and durability, and can solve the difficult problems of leak vibration, excessive vibration and difficulties in vibration of steel-intensive.
On the basis of self-compacting concrete, the concrete mixed with random distribution of the steel fibers has not only good liquidity of self-compacting concrete and fine crack resistance of steel fiber concrete, but also overcomes the poor tensile properties or ductility shortcomings of the common concrete, In the same time, it has high crack resistance, high permeability and high toughness5.
Ru Mu8 researches the steel fiber to restrain damage of concrete from many factors.
Because the incorporation of steel fibers will affect the mobility of self-compacting concrete, so this test uses little steel fiber, the maximum content of steel fiber is 0.6%. 1.3 Test method The freeze-thaw test is to use Chinese GB/T50082-2009 Ordinary Concrete Long-term Performance and Durability Test Method Standard10 of the quick frozen method.
Beijing: Mechanical industry press, 2009, I
Online since: September 2024
Authors: Alexey Vasilchenko, Olena Rebrova, Mykola Pogribniy, Svitlana Shevchenko
Various materials, components and equipment such as high-frequency generators, modulators, inductors, various mechanical equipment, etc are used for the development of microwave technologies.
Accumulated practical experience has proved that required properties of the surface strengthened by microwave hardening can be achieved only in case of strict compliance with the given technological processing requirements, first of all, a gap between the surface being strengthened and the inductor [7, 8].
The magnetic field creates the most favorable conditions for ensuring the desired trajectory of the movement of the item relative to the inductor comparing to the mechanical spring-roller device.
Besides, the device with a magnetic head provides numerous additional advantages: the procedure for setting up the technological equipment is greatly simplified; constancy of the main technological parameters of the hardening mode and high quality stability of the surface hardened layer are ensured; independence of strengthening results from the influence of subjective factors.
In order to study the obtained properties and microstructure of the turbine blade, samples (steel 15H11MF) were made at different distances from the top of the blade.
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