Search results

A series of mesoporous TiO2 supports were synthesized by the sol-gel template method by using different surfactant and Au/TiO2 catalysts were prepared by the solution reduction method.
In recent years, gold clusters supported on titania (Au/TiO2) have been shown to be very active catalysts for selective oxidation of propene, nitrogen oxide reduction, and relatively low-temperature CO oxidation [9,10].It has been well established that the catalytic properties of gold for CO oxidation are not only determined by the particle size but also largely dependent on the nature of the support and the preparation procedures, which give the very complex nature of gold catalysis [11].
For comparison, P25 was purchased from Degussa. 2.1.2 Catalyst Preparation The Au/TiO2 catalyst was prepared by solution reduction method with chloroauric acid tetrahydrate (HAuCl4, AR, Sinopharm Chemical Reagent Co., Ltd) as the precursor and mesoporous titania as the support.
Data were evaluated using the BET and BJH methods to calculate the surface area and pore size, respectively.

Thermal reduction of graphite oxide is the method used to obtain bulk quantities of graphene platelets (GPL) which comprise multiple graphene sheets.
In this work, thermal reduction of graphite oxide was used to obtain bulk quantities of graphene platelets (GPL) which comprise multiple graphene sheets.
b) a) Fig.2. a) Load-depth response of elastic-plastic material during nanoindentation, b) AFM image of nanoindented Epoxy sample Atomic Force Microscopy (AFM) image of the indented site in epoxy are shown in Fig. 2b The Procedure to Calculate the Hardness and Reduced Modulus: The procedure was developed by Oliver and Pharr [2] to measure the hardness and elastic modulus of a material from indentation load–displacement data obtained during one cycle of loading and unloading.
Reduced modulus, elasticity modulus and hardness of graphene platelet (GPL)-epoxy nanocomposite measured from force-depht curve under load controlled nanoindentation Load (µN) Loading rate (µN/s) Er (GPa) E (GPa) Hardness (MPa) 2000 200 2.86 2.61 174 4000 200 2.22 2.02 135 6000 200 1.79 1.63 118 8000 200 1.63 1.49 112 Conclusions and Comments Thermal reduction of graphite oxide was used to obtain bulk quantities of graphene platelets (GPL).

The influence of size reduction of SrFe12O19 powder particles on magnetic parameters of the studied nanocomposites were discussed in detail.
b) a) Fig. 3 Magnetic data for nanocomposite pellets containing nano Ni and SrFe12O19 (as received and milled) powder versus concentration c: a) saturation magnetization Ms, b) residual magnetism Mr.
It seems, that the size reduction effect results in higher disorder in magnetic moment structure of the strontium ferrite particles, so an increase in (m)SrFe12O19 concentration gives a slight decreases in Ms (from 51 to 46 emu/g, see Fig.3a).
Concluding remarks Main conclusions can be formulated as follows: i) presence of Ni nanopowder in A-E+SrFe12O19 composite improves its elastic properties, e.g. for 36 wt. % of Ni the observed increase of Ea is about 80 % ii) size reduction of the SrFe12O19 powder particles causes an increase of coercive field Hc from 1 to 1.8 kOe and iii) replacement of the as received micron size strontium ferrite particles by the milled ones results in the significant decrease in saturation magnetization Ms and residual magnetism Mr.

The cutting followed by burnishing, used like a combined process, leads to the improvement of the part surface quality (roughness, hardness, microstructure etc.) and to reduction of the costs and manufacturing times as a function of different working parameters.
Introduction The cutting followed by burnishing, used like a combined process, leads to the improvement of the part surface quality (roughness, hardness, microstructure etc.) and to reduction of the costs and manufacturing times as a function of different working parameters.
The burnishing- turning combined process determines the following effects on the machined surface quality: the considerable reduction of the surface roughness, the increase of the material microhardness, the elongation of the material grains in the rolling direction, the occurrence of the compressive residual stresses in the surface layers, the occurrence of the cracks in the surface strata for a pressing pressure of 150 bar [1, 2].
The strain gauges used for determination of residual stresses were of HBM 1.5/120RY61S type, their signal being captured by a SPIDER 8-30 data acquisition device and processed using the Residual Stress Management System.

However, sometimes DPIV images are overexposure, uneven distribution of the gray values, and obscurity on the edges of the particles, which will affect the accuracy of flow data by inversion.
In the different stages: boundary treatment, noise reduction, identification and elimination of the error vector, which are applicable to the processing of the DPIV information for getting the velocity vectors with higher resolution and precision through the continuous wavelet transform of velocity data.
These researches can be roughly divided into two groups: (1) identifying the turbulent or eddy structure by the wavelet analysis of experimental data and simulation data; (2) developing turbulence modeling and numerical methods using wavelet bases [1].
(1) Compute the wavelet coefficients of vector data based on the discrete wavelet transform
Analysis Results DPIV images may be overexposure, uneven distribution of the gray values, and obscurity on the edges of the particles, which will affect the accuracy of flow data by inversion.

This paper synthesizesdomestic and foreign literature on data to study theproperties of concrete under high temperature, the more consistent view, point out the shortcomings of this research, puts forward the problems need to be solved further, proven direction for the study on high temperature properties of concrete.
The rapid development of economy brings new challenges toconcrete fire, according to data released by the National Bureau of statistics, in 2012 there were all kinds of fireaccident 152157, direct economic loss of 2177163000 yuan, killed 1028 people, injured 575 people [1]. 
The following table is a set of data records at home and abroad in recent years, reinforced concrete structure fire conditions [2].
However, many small sample, discrete data, lack of systematic statistical analysis, they can not reflect its authenticity
(2) Due to the complexity of the fire scene, many of the high temperature properties of concrete used in heating systems, heating equipment, heating method is not uniform, can not accurately simulate the full scene of the fire, so that test data can not be prepared to reflect the actual situation of deterioration of concrete under the law

Strength reduction method based on numerical simulation technology changes this situation.
In the strength reduction method, safety factor of slope stability is defined as: While the slope just reaches the critical failure state, the degree reduce on rock soil shear strength, that safety factor is defined as ratio of the actual shear strength of rock soil and the shear strength after reduction when happens critical failure.Points of strength reduction method is using type 1, type 2 to adjust the strength indicators and of rock and soil ( in the type, is cohesive force after the reduction, is friction angle after the reduction, is reduction factor), then make numerical analysis for the slope stability, continuously increase the reduction factor, calculate repeatedly, until it reaches the critical damage, the reduction factor is the factor of safety.
The data as shown in table 2.

Relying on experimental test data, the model which had the nonlinear relationship between the effective tensile force and anchorage segment increased stiffness coefficient was established.
Specification [2] suggest that the vertical prestressed calculation with the method of reduction coefficient of 0.6, and considering the construction could not effectively meet the design requirements.
The problem of vertical prestressed tension loss is largely caused by human factors, the nut is not tight, installation factors lead to the vertical prestressed tension reduction.
Fig.4 Measuring of testing field Based on test data and Eq. 7, the theory value of k can be obtained.
in table 1, the following conclusions can be obtained: (1) the k value increased along with the effective tension is nonlinear, the main reason is that nut bite more and more tight. (2) at the same level of tension, the action of a first order modal frequency w diminishing with the increase of the exposed section of the steel bar length is nonlinear. (3) the theory value k and the finite element solution k are all in the same rule, two groups of data are basic closed.

It calcualted data that the air layer thickness has about 3.9 times more impact that the glass thickness in composition of double glass.
First of all, carbon emission trading is expected to begin from 2015, which will lead to an effective reduction in carbon emissions.
Therefore, this study aims to seek the most efficient model to increase energy efficiency by changing windows and doors that have a great impact on energy-saving in a combination of glass and to propose the necessity of remodeling for energy reduction by performing a comparative analysis of the insulation performance of the current windows and doors with those replaced.
The central library is situated at longitude 37.3°N, latitude 127°W and 120m altitude, and the weather data of Suwon was used, and the International Standard Time(Tokyo) +9:00 was also used.      
Setting data Item Data Clothing Light Business Suit 1.0 Humidity 60% Lighting Level Office Desk / Work shop 400lux Air Speed Barely Noticeable 0.3m/s Occupancy Reading - 55W Internal Gains Sensible Gain 40 / Latent Gain 60 Infiltraion Rate Air change Rate 0.5 / Wind Sensitivity 0.1 Active System Full Air Conditioning Efficiency 85% Thermostat Range Lower Band 18℃ / Upper Band 26℃ Hours of Operation On 09:00 / Off 22:00 Analysis It shows the cooling and heating load according to the combination of double glass.

And now, with the gradual reduction of the influence of the financial crisis, the online purchase intention for consumers is changing subtly.
And now, with the gradual reduction of the influence of the financial crisis, the online purchase intention for consumers is changing subtly.
The average value will be calculated after the data are collected.
Other data shows that, for once again shopping, the students tend to select in the same shop, while there is no obvious trend for working groups.