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Online since: October 2011
Authors: Zuo Gang Guo, Qian Qian Yin, Shu Rong Wang
Crude bio-oil has some inferior properties, such as low heating value, high oxygen content, acidity and instability.
Mechanical agitation was widely used in preparing the emulsion fuels in early studies, and many researchers did lots of works on this field [3,4,5].
Fig. 1 shows that the stability of bio-oil and 0# diesel emulsion is greatly affected by the HLB values.
These factors strengthened as the ultrasonic power increasing in the initial stage, which lead to a more homogeneous of the dispersed phase.
Online since: September 2013
Authors: Li Lin Cao, Qi Yin Shi, Zhen Wang, Chao Liu
In order to investigate the mechanical properties of SCCB, Five specimens are designed according to the simplified plastic calculation method and theory of elasticity.
And it also shows that measured results and calculated values coincide very well with these composite beams in which thickness of the cross sections are the same, for these composite beams’ bottom plates are thought that the calculated value are on the safe side, and is the reason that the bottom plate will play a major role in all bearing capacity factors.
From the contrast of element2 and element3 we know that flexural capacity can be increased by increasing concrete strength when other factors are the same. from the contrast element2 and element4 we know that the change of cross section has little effect on flexural capacity of composite beam when the strength of concrete and steel are the same.
The main factors are the performance of a variety of materials which are affected.
Online since: March 2024
Authors: Papot Jaroenapibal, Komsak Harachai, Napat Triroj, Panya Wintachai, Nujira Kothanamn
Introduction Electrodeposited nickel-phosphorus (Ni-P) alloys find extensive use as protective coatings for mechanical parts in various applications.
A pivotal consideration in Ni-P electrodeposition is maintaining control over composition, a factor that profoundly impacts the coating's properties.
This higher content affects the structure, hardness, and magnetic properties of the Ni-P deposit [2].
This method has been studied to enhance the coating's properties.
While previous studies have explored the effects of pulsing parameters on coating properties, reports on the effects of the duty cycle on phosphorus content and coating hardness are sparse.
Online since: August 2004
Authors: Roland Streiff, John Stringer
Turbine inlet temperatures have risen by 6 to 9o C per year over the last 30 years, mainly in part because of improvements in the mechanical properties of alloys and in their resistance to corrosion, through the use of protective coatings in particular.
(8) Effect of coatings on the mechanical properties of the substrate, particularly in high- and low-cycle fatigue, and corrosion fatigue
In the second meeting, we generalized this to the interaction of corrosion and mechanical factors; however, the response, although satisfactory, was not as great as we had expected; and in the third and fourth meetings there was very little on these topics.
However, the recognition that the most important factor in assuring prime reliance is related to the bonding of the TBC itself to the component, and that this function depends on the TGO and its properties, has made this clearly appropriate for our Symposia.
The growth of the protective oxide on a coating, and particularly the stability of the protective oxide subject to mechanical strains and thermal cycling and the effect that the coating itself has on this, is clearly relevant; and the ways in which the coating methods affect these aspects may well be important.
Online since: April 2014
Authors: Jun Hui Zheng, Bing Li
Introduction Fire accident happened year after year, especially in high-rise buildings, factories and mines and forests, which caused huge casualties and property losses.
Wireless sensor networks using ZigBee communication technology are widely applied in fields of industrial, manufacturing, mechanical automation, monitoring and control, oil field, electric power, mining, logistics management and medical care, etc. [5].
Air relative humidity can directly affect the evaporation of fuel moisture content; air temperature can change the physical properties of fuel indirectly by environment.
So the atmosphere relative humidity and air temperature are two main factors that influence the fuel moisture content.
In the wireless sensor network, some of sensor nodes may fails due to energy exhaustion or environmental factors; some are added to make up for the failed ones and to improve the monitoring accuracy.
Online since: August 2007
Authors: Moe A. Khaleel, Saïd Ahzi, N. Joulaee, Ahmed Makradi
It is noted that such enhancement in fracture property is mainly attributed to the crack deflection capability in the interlayer of such systems.
Gong and Horii [9] calculated the increase in stress intensity factor at the tip of a crack as a microcrack (flaw) was moved closer to it, as shown in figure 1a.
They noticed that putting a flaw just in front of the crack tip approximately doubles the stress intensity factor at the crack tip, MAK .
Crack deflection In layered systems, the fracture energy of an interlayer relative to the ones of the adjacent layers affects strongly crack deflections.
Rice: microstructure dependence of mechanical behaviour of ceramics, in Treatise on materials science and technology - properties and microstructure (R.K.
Online since: January 2009
Authors: Xiao Yan Lin, Feng Liu, Xue Gang Luo
However, the adsorption properties of konjac glucomannan without blocking functional groups for heavy metals have seldom been studied.
Preparation of WIKGM. 20 g konjac glucomannan flour (50-150 µm) was dispersed in mixed solution of alcohol (50 mL) and 12.5% (W/V) NaOH solution (70 mL) in a three-necked round-bottomed flask (500 mL) equipped with a mechanical stirrer.
The significant shift from 3409 to 3424 cm-1 in this band region after Pb2+ adsorption indicated that the O-H vibration was affected due to Pb2+ adsorption.
As can be seen from the Fig. 2, the removal efficiency of Pb2+ was strongly affected by initial pH of aqueous solution.
The increase in the pseudo-second-order rate constant may be described by Arrhenius equation [5]: (3) Where ko is the temperature independent factor (g / (mg﹒min)), Ea is the activation energy of adsorption (J/mol), R is the gas constant (8.314 J/(mol·K)) and T is the solution temperature (K).
Online since: April 2014
Authors: Xiao Jun Liu, Yuan Feng Wu, Qian Jin Fu, Xing Rong Chu, Qing Gao Ji, Chun Feng Zhao, Qiang Wei
A key processing technology of welded steel tube for high-strength automotive drive shaft Liu xiaojun1, a, Wu yuanfeng2, b, Chu xingrong1, c,*, Wei qiang2, d, Fu qianjin2, e, Ji Qinggao2, f, Zhao chunfeng2, g 1 School of Mechanical, Electrical & Information Engineering, Shandong University at Weihai, Weihai 264209, China. 2 ShanDong TaiFeng  Steel  Industry  Co., Ltd, Xintai 271200 , China.
Welding process Weld quality is an important evaluation factor for drive shaft tube.
It contributes to process control of pipe edge position, weld center deviation, extrusion capacity, dimensions, metal flow lines up angel, weld and heat affected zone widths.
The weld fusion line width (vertical straight white line in the center) is 0.07mm within 0.04-0.19mm and the heat-affected zone width is 1.07mm within 0.36-0.69 times tube wall thickness.
ZQS700Z weld tube flattening/flaring tests performances Tensile properties Ultimate strength / MPa Yield strength / MPa Total elongation / % 750~950 ≧700 ≧17 Flattening test Weld position Flat distance / mm Result 90º 2/3D No cracks Flaring test Extension rate Result Centering taper 60º, Outside radius expanded value≧10%D No cracks Hydraulic Test Pressure / MPa Dwell time / S Result 25.1 5 No leak Nondestructive examination Eddy flaw detection Result GB/T7735 Qualified Torsion test Static torsion values / (N.M) Result 45537 Qualified Dimensions Inside diameter / mm Ovality / mm Curvature / (mm/m) Inside burr height / mm 126(+0.20~+0.22) ≦0.25 ≦0.25 +0.04~+0.06 Acknowledgement Thanks for the support of TaiFeng steel company.
Online since: January 2013
Authors: Dein Shaw, Yan Ching Huang
The meaning of optical properties for IEC 60601-2-41:2000 Optical Properties Meaning Max.
We stimulate optical properties for eight groups, and the meaning of each group is in Table 5.
We can find that no matter what the extension value is, their optical properties don’t change largely.
Combination various factors, group d is our best LED module.
Finally, LED module design in this study has better optical properties.
Online since: February 2014
Authors: Jie Guo
Under random road excitation, vibration responses of the driver's seat were simplified during uniform linear driving: (1) For the ease of calculation and finite element mesh, the rounded corners and etc. were omitted;(2) During uniform linear driving, the steering, braking and power-train system vibration input were ignored, the weights were added to the corresponding location of the frame and wheels;(3) Aerodynamic factors on the impact of the vehicle were not considered during driving.
Typically, q(I) function which represents the pavement height q relative to the reference plane changed along with the road length I is called the pavement profile curve or roughness function and describes its statistical properties by road power spectral density as the road roughness of vehicle input vibration.
That model fully takes the suspension, hinged frame and balance beams and other mechanical systems affects into consideration.
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