Search results

TiO2 is a semiconductor that possesses superior chemical and physical properties, widely used in various fields.
In sonochemical synthesis, it is necessary to analyze several factors so that the particles formed are uniform with a narrow size distribution.
Kovač, Photocatalytic properties of TiO2 and TiO2/Pt: A sol-precipitation, sonochemical and hydrothermal approach, Ultrason.
Manaf, Enhanced dielectric properties of Nanocrystalline Ba(1-x)SrxTiO3(x=0 and 0.3) ceramics, in: IOP Conf.
Esquivel, Self-cleaning of SiO2-TiO2 coating: Effect of sonochemical synthetic parameters on the morphological, mechanical, and photocatalytic properties of the films, Ultrason.

Design Analysis of A New Transmission Device for High-speed Precision Micro-shafting Wei LI a, Zhixiong ZHOU b, Tiejun SONG c, and Hang XIAO d College of Mechanical and Vehicle Engineering, Hunan University, Changsha, Hunan, 410082, China aliweihnu123@gmail.com, bzhouzx8@sina.com, ctie8yu@163.com, dxiaohang0420@126.com Keywords: transmission device, calculation model, micro-shafting, micro-spindle.
According to strength condition σc max <[σ]= σs /ns, the design calculating model of the elastic shaft coupling can be expressed as 3T l / (2rbh2+b2h2)+ Fax / (2bh)+ aEh / (2lc+2l2)< σs / ns, (6) Where [σ] is allowable stress, σs yield strength, ns safety factor.
Table 1 The known parameters for design calculation and FE analysis Part Item Parameter Value(unit) Spindle Properties Young’s modulus 206(GPa) Poisson’s ration 0.28 Clamp ring Properties Young’s modulus 75(GPa) Poisson’s ration 0.3 Dimension Outer diameter 7(mm) Tool Properties Young’s modulus 640(GPa) Poisson’s ration 0.22 Dimensions Outer diameter 3.175mm(-5～0μm) Length 38.1mm Loads Torque 5(N·mm) Axial force 5(N) Deviation 0.1(mm) Fig. 2: Maximum positive stress vs. height and length Fig. 3: 1/4 FE model of the elastic shaft coupling Fig. 4: Stress caused by torque Fig. 5: Stress caused by axial force Fig. 6: Stress caused by deviation Fig. 7: Stress caused by combined load Fig. 8: Stresses by different loads in rotating Collet And Clamp Ring.
A centrifugal force seriously affects the clamping force when the rotational speed exceeds 1 000 000 rpm [5], so it was ignored here.

The development of Standards and Legislation of Heat Technology in the Czech Republic Thermal-technical parameters of building envelopes affect not only the energy requirements of the building, but also a thermal comfort and indoor environment, as well as ultimately contribute to an efficient energy management.
Temperature requirements of internal surfaces of structures using the temperature factor of the internal surface are evaluated.
These trends are reflected in the requirements for even greater energy savings in the design of larger thickness of thermal insulation, better heat insulation properties of thermal insulators, greater mechanical strength, intensity and color fastness, resistance to biological pest control, etc.
Diagnostic measurings of construction physical properties of the selected objects have been in progress since 2006 to date [8].
Brno: CERM Academic Publishing, Ltd., 2010, Chapter 5.1.8 titled Example of calculation and measurement of the thermal properties of wooden houses in Ostrava-Muglinov, pp. 103-108), ISBN 978-80-7204-732-1. (30% of mental sharing) [6] PEŘINA, Z., SKOTNICOVÁ, I., MARYNOWICZ, A.

Introduction The continuous increase of the application of fibre reinforced plastics (FRP) is based on the constant enhancement of their mechanical and thermal properties, resulting in higher specific strength and stiffness, which is used especially for dynamically moved components.
The delamination factor for every single tool exit side from the analyzed surface ratios was calculated.
Drilling holes using the grain size D126 results in a high delamination factor especially at feed rates higher than f = 0.08 mm/rev.
The delamination factor can be kept below DF = 0.2 up to a feed of f = 0.1 mm/rev for the tool with the D301 grain size.
The diameter deviation of the drill hole is strongly affected by the dynamic resilience of the machining centre and thus the programmed cutting speed.

Due to the mechanical motion, these lenses have some problems in response time, cost and stability.
Therefore, it is highly desirable to develop an adaptive lens without mechanical moving parts.
Under such circumstance, surface tension is key factor to affect the liquid droplet compared with other forces.
When applied voltage is zero, according to the material’s property, shape of liquid interface is horizontal.
Lett, 2004, 85 (7): 1128 [11] Shen Jinxia, Peng Runling, Chen Jiabi, “Analysis on properties of the double- liquid zoom lens based on electrowetting,” OPTICAL INSTRUMENTS, 2007.8, Vol. 29.

These core factors have influence on the microstructure and properties of HEA.
High entropy alloys always possess many wonderful properties, such as high hardness, good wear resistance and corrosion resistance.
AlFeCoNiCuCr and AlCoCrNiMo HEA coatings have been prepared successfully, and their microstructure and properties have been investigated.
Effect of alloying elements on microstructure and properties of multiprincipal elements high-entropy alloys.
Microstructures and properties of high-entropy alloys.

The choice of the method to adopt depends mainly on the following factors: sample size and shape, temperature range and thermal-conductivity range [3].
The moisture effusivity is theoretically based on material properties which are determined under steady state and equilibrium conditions.
Furthermore these types of pore affect the thermal properties
ü Roughness factor [m2/m2] Ratio of the external surface area to the area of the geometrical envelope of the particles.
Allison, a), Analysis of the hygrothermal functional properties of stabilised rammed earth materials.

The last factor includes the composition and properties of the surface films on the particles formed at their preparation and storage, which may affect the process both thermodynamically and kinetically [45].
First of all, it regards the situation when nanopowders may absolutely vary its chemical, physicochemical and adsorptive properties.
Cheetham (Eds.), The chemistry of nanomaterials: synthesis, properties and applications, Wiley, Weinheim, 2005, 94-112
Sidorov, Mechanical Properties and Structure of Zinc-Containing Latex-Silicate Composites, J.
Fenin, Synthesis and properties of zinc nanoparticles: The role and prospects of radiation chemistry in the development of modern nanotechnology, Prot.

Bao[1] pointed out that excessive noise of the factory workshop affects the physical and mental health , reduces work efficiency, and causes disease and even accidents.
Mei[6],which mainly includes finite element design, optimization design, computer aided design, mechanical reliability design, and so on.And, modern design method has been used in the fan noise reduction.
Meng[13] studied that the non-steel fibre could enhance vibration and noise performance of friction material in frequency domain and time domain and mainly discussed the material of damping coefficient and other factors impacting on vibration and brake noise.Z.G.
Zhong: Leaf Mechanical Pneumatic Acoustic Translation Essays(beijing:China Machine Press,China,1987) (In Chinese) [4] S.M.
Zhou: Mechanical Vibration and Noise Learn (Beijing:Science Press, China 2004), p.246 (In Chinese) [16] G.Q.

Chemical Mechanical Polishing (CMP) has been successfully used for planarization of silicon wafer as the final polishing method, and the Double-Sided-Polishing (DSP) is rapidly developed for the demands of the ultra large size silicon wafer manufacturing (300 mm).
The aims of the slurry use are divided to be chemical and mechanical action in the CMP process and its performance is depended on the choice of the abrasive articles, their particle size, particle concentration and slurry pH values etc.
Also the pH value indicates the chemical property of the slurry, and different materials need polishing slurries with different pH value in the CMP process.
It is shown that the pH value of polishing slurry is one important factor influencing the polishing rate, and the higher value PH results in the maximal material removal rate and the minimal surface roughness in the case of alkali slurry in this experiment.
Acknowledgements This project is supported by the Zhejiang science foundation (M503049), Zhejiang technical foundation (2004C21007).This work was granted financial support from the Key Laboratory of Mechanical Manufacture and Automation, (Zhejiang University of Technology), Ministry of Education.