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Experimental Study on the Second-order Buoyancy of Magnetic Fluid He Xinzhi1,2 Li Decai2,b Yang Wenming2 Zhang Haina2 1School of Mechanical Engineering and Automation, Beihang University, Beijing 100083, China 2 School of Mechanical Electronic and Control Engineering, Beijing Jiaotong University, Beijing 100044, China bdcli@bjtu.edu.cn Keyword: Magnetic Fluid, Buoyancy, Fluid Statics Abstract.
And the rule describes factors affecting the levitation force under the same condition [13].
However, the measurement of the radial levitation force suffered by the cylindrical magnet which immersed in the magnetic fluid has not been reported, so as to the influence factors.
The radial second-order levitation force suffered by the cylindrical magnet which immersed in the magnetic fluid was measured by experiment in this paper, and the influence factors were analyzed as well.
The influences on the value of levitation force made by the above factors are discussed by the experiments in this paper.

Effects of cooling air temperature and cutting velocity on cryogenic machining of 1Cr18Ni9Ti alloy S.M.Yuan1, a, S.Liu1,b and W.D Liu1,c 1School of Mechanical Engineering and Automation, Beihang University, Beijing, 100191, China ayuansm@buaa.edu.cn, bliusiperfect@126.com, cliuweidong_buaa@163.com Keywords: Minimal Quality Lubrication (MQL), Cryogenic machining, Stainless steel, Cooling air temperature, Cutting velocity, Cutting force, Tool wear Abstract This paper presents experimental investigations on influences of cooling air temperature, as well as cutting velocity, on performance in milling of the 1Cr18Ni9Ti alloy with coated cemented carbide inserts.
This may be explained by the mechanical effect of the MQL system, which consists a mixture of cooling air and oil micro droplets.
The function of the cooling air is to flush away the chips from the cutting zone (flushing effect) and reduce the cutting temperature, which are two very important and correlated factors affecting milling of 1Cr18Ni9Ti [6].
It is well known when machining of 1Cr18Ni9Ti, the temperature is very high because of its unfavorable machining properties as mentioned above.
The surface finish can significantly affect the mechanical strength of components when they are subjected to fatigue cycles.

Grinding temperature affects ground workpiece surface quality and cutting characters of the grinding wheel.
Furthermore it will affect the dimensional accuracy and the form accuracy of the workpiece [1].
Conclusions As the discussion above, some conclusions can be drawn as following: 1) The numerical model for grinding of titanium alloy has been developed depending on the transient thermal analysis and the finite element (FE) analyzing method, some main factors for modeling process, including the three kinds of compound boundary conditions, the variable coefficient of convective heat transfer and the different types of heat sources, has been discussed in details. 2) Based on the analysis of the grinding temperature field model, some simulation results are obtained.
Song: Chinese Mechanical Engineering, Vol.9 (1998) No.4, pp.2
Zhang: The Finite Element Method (Mechanical Industry Publications, China 1992)

Their identical properties such as high surface porosity and perfectly patterned pore structure, which is combined with mechanical strength make them ideal for many applications such as microorganism removal, blood filtration and protein purification.
Plasma treatment is widely used to tune the surface properties of many polymers (e.g.
SU-8, Polyimide and PDMS) to promote adhesion or to enhance wetting properties [6,7].
PDMS, PMMA, PC, SU-8 and, etc.) to promote adhesion or to enhance wetting properties [14].
It should be noted that membrane fouling related to many factors such as membrane properties (i.e. pore size, material, hydrophilicity/hydrophobicity and, etc.), solution properties (i.e. concentration, particle size, and, etc.) as well as operation conditions (i.e. pH, temperature, flow rate and, etc.) which all need to be take into account during a filtration process [1-3].

According to Archard's wear model, normal contact force and sliding distance directly affects the wear.
Characteristic areas on sheared edge profile, variation of punch force and high contact pressures affected areas have also been analysed.
Past research into tribology suggest that wear of the material is not an intrinsic material property, which is affected by many factors (including the application situation).
The characteristic area on the sheared edge profile, punch force versus punch displacement curve, and high contact pressures affected areas have been extracted from FE simulations.
Cutting process parameters, such as the sheet metal and tooling materials, sheet metal thickness and clearance affect the mentioned zones [8].

Materials and Methods The influence of calcium stearate on the technological properties of the cement-sand mixture, on the strength characteristics, capillary water absorption, and water absorption kinetics was investigated.
Results The technological properties of the concrete mixture were investigated: density, air entrainment, mobility. 3.1.
Conclusion The main goal of this work was to compare the effects of powdered CS and CS in the form of a suspension on the technological properties of the concrete mixture and the physical and mechanical properties of fine-grained concrete.
[6] Maryoto A., Gan B.S., Hermanto N.I.S., Setijadi R: Effect of Calcium Stearate in the Mechanical and Physical Properties of Concrete with PCC and Fly Ash as Binders.
Influence of freeze-thaw cycles on properties of Integral Water Repellent Concrete.

Conditions of Simulation and Experiment The material used in investigation was a CuZn37 alloy with a sheet thickness of 0.20mm, whose mechanical properties are presented in Table 1.
Mechanical properties of metal sheets Young modulus [MPa] Yield strength [MPa] Poisson ratio - Anisotropy coefficients Total elongation [%] 00 450 900 115000 24.55 0.3 0.725 0.848 0.888 36 Table 2.
Mechanical and deformability properties of the CuZn37 alloy The parameters of the mini drawn parts, tools, blank and deep drawing process, used in simulation and experimental tests, were as follows: part diameter (D), part edge radius (rep), tool clearance (c), punch edge radius (rp), punch diameter (Dp), die diameter (Dd), blank diameter (Db), initial foil thickness (t0), drawing depth (d), blank holder force (BHF) and friction coefficient (µ).
Optimal working parameters obtained by applying the GAs friction coefficient blank holder force [N] ring 1 ring 2 ring 1 ring 2 x(1) x(2) x(3) x(4) Dp=2.00[mm] 0.125 0.110 15 20 Dp=20.00[mm] 0.110 0.100 100 65 The geometric parameters of the mini drawn part defects generated by different factors of influence resulted by using the optimal values of the working parameters obtained from Genetic Algorithms application are presented in Table 8.
The part quality is significantly affected by the flow of metal into the die cavity, an excessive flow conducting to part wrinkling.

Properties of rotor-stator interface directly affect motor’s conversion efficiency, service life, running noise, and drive stability, etc.
Friction coefficient is the key parameter which affects the output characteristics of motor.
But it hardly affected the no-load speed.
Micromachined traveling wave motors: Three-dimensional mechanical optimization and miniaturization limits evaluation.
Practical consideration of shear strain correction factor and Rayleighdamping in models of piezoelectric transducers.

Its appearance is connected with the decrease of mechanical properties, toughness and contraction mainly.
It is proven that important influence on mechanical properties has the size of precipitates besides the amount of IG facettes.
There are not any specific criteria to determine its defectivity and mechanical properties values are crucial.
The presence of shiny rows causes a decrease of mechanical properties (mainly plasticity).
IG cleavage - their presence is connected with an important degradation of plastic and brittle-fracture properties.

Research on Fiber Preparation Section with Life Cycle Assessment Theory Jie Song1, a, Na Jia2,b , Bing Ge3,c and Jun Hua4,d 1 College of Mechanical and Electrical Engineering ,Northeast Forestry University Harbin Heilongjiang, 150040 2 College of Mechanical and Electrical Engineering ,Northeast Forestry University Harbin Heilongjiang, 150040 3 College of Mechanical and Electrical Engineering ,Northeast Forestry University Harbin Heilongjiang, 150040 4 College of Mechanical and Electrical Engineering ,Northeast Forestry University Harbin Heilongjiang, 150040 asongj2017@sina.com, b jiana1975@sina.com, cgebing2012@sina.com,dhuajun81@163.com Keywords: Fiber Preparation Section, Life Cycle Assessment, Environment Load Factor, Technology and Equipment Abstract.
Thus, the environment load factor of each process can be determined, as shown in Table 1.
At present, the main characterization models are load model, SETAC equivalent model, inherent chemical properties model, overall exposure - effect model, point-source exposure-effect model, etc.
Through an in-depth analysis to the fiber preparation section, the environmental load factors are determined.
In all, with the theoretical framework system of the fiber preparation section, as well as the end-based evaluation methods, the extent of the environmental impact affected by the different production techniques and devices match is evaluated.