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Online since: September 2011
Authors: Hai Gang Sun, Yong Zhou
In addition, the thermal performance is influenced by other environment factors (for instance, pressure drop of cooling liquid flowing through heat sink will be determined by the temperature and flow rate) [5].
So the more efficient measure for thermal analysis of heat sink influenced by many other factors is to observe the variation of thermal performance with a single structural parameter.
Of which, the dynamic are comparatively intricate and synchronously determined by many other unpredictable factors, so only the static are discussed in this research including maximal temperature rise of heat elements, pressure drop and temperature rise of cooling liquid flowing through heat sink.
However, the predominant factor may change for different criterion.
Remarkably, some non-structural factors may have a slight effect on the criterions which fluctuate in a permissible narrow range.
Online since: December 2013
Authors: Jin Hua Tan, Xue Wen Su, Hao Wu, Hong Jun Liu
If the differential settlement after construction of the subgrade is too large, not only the pipelines will be damaged and broken affecting the normal work condition, but also the surrounding environment is polluted resulting in serious consequences[3,4].
The basic physical and mechanical properties of the two kinds of soft soil are shown in table 1.
The main reasons of the monitoring result are caused by factors such as the embankment height, the burial location, and thickness of the soft soil layer.
The individual monitoring test results are related to the factors such as the specific engineering geological conditions and loading process.
The main reasons of the monitoring result are caused by factors such as the embankment height, the burial location, and thickness of the soft soil layer.
Online since: April 2014
Authors: Ming Liang Zhu, Yan Sun
Mechanical properties of this structure were investigated through nonlinear buckling analysis by the consistent imperfect buckling analysis method, compared with the single layer LICS.
In addition, some factors are studied including prestress level, bar section, length of bar, rise-span ratio, obliquity and so on, which may influence the ultimate bearing capacity of the SLICS.
Because of the introduction of prestressed cable-strut system, the stability properties of the SLICS are similar to the beam string structure.
The stability is mainly affected by the strength of materials.
Parameter analysis In order to study stability properties of the SLICS, Structure parameters including prestress level, member section, length of bar, rise-span ratio, obliquity were analyzed.
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 2016
Authors: Rômulo de O. Pletsch, Kleber G.B. Alves, Magda R.S. Vieira, Celso P. de Melo, Nadège S. Bouchonneau
Approximately 90% of all metal surfaces are coated and factors such as the composition, the application processes and the possibility of combining organic and metallic paints have increased the interest of this type of coating for corrosion protection [2,3].
Use of epoxy resins is widely spread mainly due to properties such as continuity, flexibility, excellent adhesion to metallic substrate and chemical resistance in various aggressive environments.
The environmental condition to which the material is exposed is one of the factors that most influence the corrosion process.
Other factors such as pH, temperature and mechanical stress to which the exposed material could be subjected to should also be considered [6].
Evaluation of corrosion resistant properties of the coating by EIS and OCP studies To evaluate the efficiency of the coatings against SAE 1020 carbon steel corrosion, electrochemical tests were performed, such as Open Circuit Potential (OCP) and Electrochemical Impedance Spectroscopy (EIS) using an aqueous solution of 3 wt% NaCl to simulate the marine electrolyte.
Online since: October 2011
Authors: B. Rajendra Prasath, Porai P. Tamil, Mohd. F. Shabir, P. K. Devan, S. Vigneshvaran
By accounting the drawbacks associated with the use of SVO, it is found that, the chemically treated vegetable oil called “biodiesel” is a promising fuel, because of their properties are similar to that of diesel fuel (DF).
To reduce the level of oxides of nitrogen, emission control techniques such as exhaust gas recirculation (EGR) [6]–[8] could be adopted without affecting the engine performance.
The important physical and chemical properties of the biodiesel were measured and compared with ASTM standards as shown in Table 1.
The calorific value is acting as one of the limiting factors to estimate the thermal efficiency.
The effects of vegetable oil properties on injection and combustion in two different diesel engines.
Online since: August 2016
Authors: Volker Schulze, Frederik Zanger, Boris Matuschka, Nikolay Boev
The resulting data enabled the calculation of scaling factors that allowed the effective forces in the intended bar-turning tests to be determined.
The goal pursued with this setup was to determine the effects of damping properties and relevant cutting conditions on maximal impact forces.
Simulation-based Investigation Simulative characterization of mechanic properties and dynamic behavior.
This analysis of mechanical and dynamic properties provided so-called mastercurves that depict the viscoelastic indicators of each material over a wide frequency range.
So far, the dynamic properties of the measurement setup’s components haven’t been considered in the implementation of the simulation model.
Online since: December 2010
Authors: Qi Zhou, Ji Ping Hao, Ping Lv, Jin Jie Men
Curing agent and reactive diluent are important factors in strength.
Factors and levels of each sample are listed in Table 1.
Three factors and two levels are listed in Table 2.
The results [4] show that curing agent and reactive diluent are main factors which affect the strength of adhesive.
The most important factors that affected the tensile strength are curing agent and reactive diluent, where the influence on strength is almost the same.
Online since: November 2013
Authors: Feng Zhao, Yan Jing
Therefore, its processing efficiency is particularly high, and the surface roughness can generally reach Ra0.1 ~ 0.2μm. [2] 1- Guide sleeve; 2- Rough boring tool; 3 - Floating boring tool; 4 - Cutter body; 5 - Roller; 6 - Force transfer body; 7 – Median septum; 8 – Raceway nest; 9 - Rear bulkhead; 10 – Half watt; 11 - Thrust bearing; 12 - Bearing housing; 13 - Boring bar Fig.2 The structure of boring-rolling compound tool Analysis of influencing factors in rolling process: Cylinder surface suffers the most significant and the most sufficient plastic deformation in the first rolling, its surface quality then is significantly improved, but the subsequent effect will be not so evident any more; in contrast, with the increase of rolling frequency, the surface will produce excessive pressure stress, and then the surface quality obtained in the first rolling will suffer destruction, therefore, in the actual production, one-rolling process is used generally.
Rolling allowance: During the rolling process, when the compression of the workpiece is in the range of 0.1-0.2mm, the rolling effect will be the best. [3] Feed rate: Feed rate has a great influence on the micro-geometry shape and the physical and mechanical properties of the workpiece surface; when the rolling depth is under certain conditions, the fatigue strength will increase with a decreasing feed rate.
Rolling speed: Rolling speed is the linear speed of rolling workpiece rotation, and the level of rolling speed can affect not only the productivity but also the rolling quality.
Workpiece requirements: If the workpiece’s hardness is too low, and the mechanical properties are also poor, which can not achieve the desired rolling effect, hardness of the material should not be less than 140HB before rolling process; and after the rolling, the hardness starts from 280HB, the rolling effect is decreased significantly.
The rigidity of the boring bar will also affect orientation and processing quality, so the boring bar should have sufficient strength and rigidity. 
Online since: October 2006
Authors: Lars Pape, Horst R. Maier, Michael Modigell
A high-temperature Couette rheometer has been developed to analyze flow properties of semi-solid alloys up to temperatures of 1500°C.
Differently performed experiments clearly show its shear-thinning and time-dependent flow properties with a yield stress.
Such metallic suspensions show shear-thinning and time-dependent flow properties and exhibit a yield stress.
After an isothermal shearing period of 1h, step-change in shear rate experiments as well as linear shear stress ramps are applied to evaluate the shear thinning, time-dependent flow properties and the yield stress.
The left side of figure 3 clearly indicates the shear-thinning and time-dependent flow properties.
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