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Online since: July 2012
Authors: Dang Chao Cao, Zhen Zhang, Si Lu, Zhao Hui Yao, Cheng Song Fu
The experimental result of the flow drag reduction tested on macro-scale channel in laminar flow is very well, and the maximum drag reduction is 25.6%.
This phenomenon has important significance on drag reduction of super-hydrophobic surfaces.
Conclusions based on the findings are drawn: (1) In the normal channel, the experiential data of flow pressure drop is consistent with the theoretical values when Re≤2000; (2) In the super-hydrophobic channel, by the fitting experimental data curve, the friction factor can be calculated by the following equation: (7) Comparing with eq. (1), we found that the drag decreased by 25.6% in the channel with micro-nano structured super-hydrophobic surface channel.
Laminar drag reduction in microchannels using ultrahydrophobic surfaces.Phys Fluids. 2004, 16(12): 4635-4643
Drag reduction in ultrahydrophobic channels with micro-nano structured surfaces.
This phenomenon has important significance on drag reduction of super-hydrophobic surfaces.
Conclusions based on the findings are drawn: (1) In the normal channel, the experiential data of flow pressure drop is consistent with the theoretical values when Re≤2000; (2) In the super-hydrophobic channel, by the fitting experimental data curve, the friction factor can be calculated by the following equation: (7) Comparing with eq. (1), we found that the drag decreased by 25.6% in the channel with micro-nano structured super-hydrophobic surface channel.
Laminar drag reduction in microchannels using ultrahydrophobic surfaces.Phys Fluids. 2004, 16(12): 4635-4643
Drag reduction in ultrahydrophobic channels with micro-nano structured surfaces.
Online since: August 2010
Authors: Mao Fa Jiang, Yan Liu, De Yong Wang
Owing to the lack of the datas concerning the mass
transfer character of chrome molten slag, the datas from dynamic model of instant and persistent
contact reactions established by Robertson were adopted, namely km=2.4×10-3 m·s-1~4.6×10-3 m·s-1
[6].
The model described and resolved the process of chromium ore smelting reduction preferably.
Chen: Diagram and Data Manual in Steelmaking (Metallurgy Industry Publications, Beijing 1984)
Chen: Thermodynamic Data Manual of Inorganic Matters (Northeastern University Publications, Shenyang 1993)
Xiao: Fundamental research of smelting reduction (Northeastern University, Shenyang 1988).
The model described and resolved the process of chromium ore smelting reduction preferably.
Chen: Diagram and Data Manual in Steelmaking (Metallurgy Industry Publications, Beijing 1984)
Chen: Thermodynamic Data Manual of Inorganic Matters (Northeastern University Publications, Shenyang 1993)
Xiao: Fundamental research of smelting reduction (Northeastern University, Shenyang 1988).
Online since: January 2009
Authors: Ahmet Atasoy, F.R. Sale
An Investigation on the Solid State Reduction of Chromite Concentrate
A.
Identifications of the peaks were carried out by matching of the diffraction pattern and peak relative intensity with those found in the JCPDS data file using the APD programme.
The amount of mass loss during reduction therefore indicates the quantity of carbon monoxide released during the reduction and it is directly proportional to the mass of oxygen lost from the reducible oxides, and hence to the degree of reduction.
Reduction of chromic oxide to metallic chromium, after the reduction of iron, the remaining spinel consists of chromium, magnesium and aluminium oxides.
At 1300 C for 5 h, 73% reduction and 1400 ºC for 1 h 58% reduction were obtained in the mixture of chromite with metallurgical coke.
Identifications of the peaks were carried out by matching of the diffraction pattern and peak relative intensity with those found in the JCPDS data file using the APD programme.
The amount of mass loss during reduction therefore indicates the quantity of carbon monoxide released during the reduction and it is directly proportional to the mass of oxygen lost from the reducible oxides, and hence to the degree of reduction.
Reduction of chromic oxide to metallic chromium, after the reduction of iron, the remaining spinel consists of chromium, magnesium and aluminium oxides.
At 1300 C for 5 h, 73% reduction and 1400 ºC for 1 h 58% reduction were obtained in the mixture of chromite with metallurgical coke.
Online since: June 2014
Authors: Yang Du, Guo Lin Xu
Therefore, the data on the transverse rolling is rare too.
For The textured samples, the {110}, {200}, {211} of pole figure data are measured by the X- ray diffraction of Dmax-IIIA, the sectional view of Φ = 45º could be ploted by the Series expansion method of ODF; For the metallographic sample, the Optical microscope of OLYMPUS-PMG3 is used to watch the recrystallized structure. 3.
Fig .4 is constant Φ (45°) ODF sections showing Ti+P-IF steel in cross cold rolled reductions.
Fig .4 Constant Φ (45°) ODF sections showing Ti+P-IF steel in cross cold rolled reductions Fig.5 Constant Φ(45°)ODF sections showing annealed samples of Ti+P-IF steel in cross cold rolled reductions Constant Φ(45°)ODF sections showing annealed samples of Ti+P-IF steel in cross cold rolled reductions is shown in Fig .5, it can be seen from the figure, when the reduction rate is 30%, the peak is formed in texture of {112} < 110 >, and there is a weak gauss texture.
The intensity of {223} < 110 > texture comes down when the reduction rate is 70%.
For The textured samples, the {110}, {200}, {211} of pole figure data are measured by the X- ray diffraction of Dmax-IIIA, the sectional view of Φ = 45º could be ploted by the Series expansion method of ODF; For the metallographic sample, the Optical microscope of OLYMPUS-PMG3 is used to watch the recrystallized structure. 3.
Fig .4 is constant Φ (45°) ODF sections showing Ti+P-IF steel in cross cold rolled reductions.
Fig .4 Constant Φ (45°) ODF sections showing Ti+P-IF steel in cross cold rolled reductions Fig.5 Constant Φ(45°)ODF sections showing annealed samples of Ti+P-IF steel in cross cold rolled reductions Constant Φ(45°)ODF sections showing annealed samples of Ti+P-IF steel in cross cold rolled reductions is shown in Fig .5, it can be seen from the figure, when the reduction rate is 30%, the peak is formed in texture of {112} < 110 >, and there is a weak gauss texture.
The intensity of {223} < 110 > texture comes down when the reduction rate is 70%.
Online since: May 2012
Authors: Guang Ning Pu
The test data show that the beam-reduction and rib-addition strengthening method results in an obvious enhancement of the natural vibration frequency of simply supported hollow slab bridges, which proves that the strengthening method has remarkable improvement effect on the rigidity of bridges.
The study result is that the beam-reduction and rib-addition strengthening method can greatly enhance the structural behavior of hollow slab bridges.
Fig.1 Cross sections of the bridge before and after strengthening (Unit: cm) Test and data analysis Dynamic test.
This is totally identical with the result of the appearance inspection and the conclusion from the static test data.
Conclusions Based on the practical test data from a 30m-span prestressed hollow slab bridge, the natural vibration frequency and vibration mode of the bridge before and after strengthening are compared and analyzed in this article.
The study result is that the beam-reduction and rib-addition strengthening method can greatly enhance the structural behavior of hollow slab bridges.
Fig.1 Cross sections of the bridge before and after strengthening (Unit: cm) Test and data analysis Dynamic test.
This is totally identical with the result of the appearance inspection and the conclusion from the static test data.
Conclusions Based on the practical test data from a 30m-span prestressed hollow slab bridge, the natural vibration frequency and vibration mode of the bridge before and after strengthening are compared and analyzed in this article.
Online since: August 2013
Authors: Xiao Juan Ma, Wen Yong Wang
The result shows that the hourly concentration, daily mean concentration and annual mean concentration of NOX in air exceed the standard data, and the affected areas respectively account for 0.2%, 0.18% and 0.12% of the total area of the economic circle.
Whether the emission reduction of NOx of Chengdu Economic Circle can be successful is the key for finishing the task of emission reduction of NOx during “the Twelfth Five-Year Plan” in Sichuan Province.
The NOX emission of the domestic area source in the Chengdu Economic Circle (including all cities in the circle) can be calculated according to the population data of each city, energy data, per capita living energy consumption of standard coal for domestic use, liquefied petroleum gas, natural gas in each city, etc. in the statistical yearbook of Sichuan Province by using the emission factors [5] of NOX in the rural and urban household cooking range measured by Zhang J. etc in 2000 (showed as Table 4).
Therefore, the NOx concentration distribution of the whole economic circle can not be fully reflected only through monitoring data.
Therefore, the emission reduction of the NOx becomes the actual need for the protection of atmospheric environmental quality.
Whether the emission reduction of NOx of Chengdu Economic Circle can be successful is the key for finishing the task of emission reduction of NOx during “the Twelfth Five-Year Plan” in Sichuan Province.
The NOX emission of the domestic area source in the Chengdu Economic Circle (including all cities in the circle) can be calculated according to the population data of each city, energy data, per capita living energy consumption of standard coal for domestic use, liquefied petroleum gas, natural gas in each city, etc. in the statistical yearbook of Sichuan Province by using the emission factors [5] of NOX in the rural and urban household cooking range measured by Zhang J. etc in 2000 (showed as Table 4).
Therefore, the NOx concentration distribution of the whole economic circle can not be fully reflected only through monitoring data.
Therefore, the emission reduction of the NOx becomes the actual need for the protection of atmospheric environmental quality.
Online since: October 2025
Authors: Bambang Kun Cahyono, Achmad Ridwan Abdullah, Haryo Dwito Armono
The data used included tidal observations, bathymetry and topography surveys, wind and wave data, and hexareef formation data.
Study Location and Survey Area Data.
Bathymetry or Depth Data.
Depth Data to Computational Grid Results Wind and Wave.
Tidal Data Evaluation Results The RMSE value obtained from comparing observation data and tide calculations indicates adequate accuracy.
Study Location and Survey Area Data.
Bathymetry or Depth Data.
Depth Data to Computational Grid Results Wind and Wave.
Tidal Data Evaluation Results The RMSE value obtained from comparing observation data and tide calculations indicates adequate accuracy.
Online since: January 2014
Authors: Pei Yuan Lee, Jiing Yih Lai, Chung Yi Huang, Yu Sheng Hu
To achieve the goal, the proposed system must provide the following functions: 3D modeling, visualization, segmentation, bone reduction, fixation and data output.
Display of CT data.
The CT data is essentially a sequence of two-dimensional images, which can be represented as a set of volume data where a three-dimensional matrix recording the gray value of each pixel on the images is employed.
For example, the volume rendering technique can only show the surface data of the bony structure as well as its neighboring soft tissues from any section.
Accordingly, the display of 3D isosurfaces data and 2D images simultaneously enables one to catch more information from the CT data.
Display of CT data.
The CT data is essentially a sequence of two-dimensional images, which can be represented as a set of volume data where a three-dimensional matrix recording the gray value of each pixel on the images is employed.
For example, the volume rendering technique can only show the surface data of the bony structure as well as its neighboring soft tissues from any section.
Accordingly, the display of 3D isosurfaces data and 2D images simultaneously enables one to catch more information from the CT data.
Online since: November 2014
Authors: Ping Xue
Study on Preparation of Metal Sm by Metal Thermal Reduction Method
Ping XUE
School of electromechanical and architectural engineering, Jianghan University, Wuhan, Hubei, 430056
xueping20011982@163.com
Keywords: Metal thermal reduction method; Metal Sm; Thermodynamic calculations; Direct yield
Abstract: In this paper, thermodynamic calculations and reaction process for the production of metal Sm by metal thermal reduction method were analyzed.
The preparing method of metal Sm is mainly metal thermal reduction method by metal Lanthanum or Cerium [2].
According to relevant references, the data of Lanthanum and Cerium reducing reaction are as follows [2]: 2Sm2O3(s)+2La(l) →2Sm(g)+La2O3(s) ΔGT=102940-48.77T+8.314Tln (0.1/101325)2≤0 T≥2110.7K Sm2O3(s)+2Ce(l) →2Sm(g)+Ce2O3(s) ΔGT=97600-47.12T+8.314Tln (0.1/101325)2≤0 T≥2071.3.7K It can be seen from the above data that the thermodynamic conditions of the reaction can be carried out above the reaction temperature 1800℃.
Experimental results and discussion 1kg drying Sm2O3 powder is weighed and added with the reduction metal at the proportion of 1:1 (the reduction metals are the chips of the La-Ce mixed metal ingot after turning).
[2] E.B.Lv, X.S.Liu, Study on the factors of metal Sm by La and Ce thermal reduction method,J.Jiangxi.Nonferr.Metal. 4(1990) 9-13
The preparing method of metal Sm is mainly metal thermal reduction method by metal Lanthanum or Cerium [2].
According to relevant references, the data of Lanthanum and Cerium reducing reaction are as follows [2]: 2Sm2O3(s)+2La(l) →2Sm(g)+La2O3(s) ΔGT=102940-48.77T+8.314Tln (0.1/101325)2≤0 T≥2110.7K Sm2O3(s)+2Ce(l) →2Sm(g)+Ce2O3(s) ΔGT=97600-47.12T+8.314Tln (0.1/101325)2≤0 T≥2071.3.7K It can be seen from the above data that the thermodynamic conditions of the reaction can be carried out above the reaction temperature 1800℃.
Experimental results and discussion 1kg drying Sm2O3 powder is weighed and added with the reduction metal at the proportion of 1:1 (the reduction metals are the chips of the La-Ce mixed metal ingot after turning).
[2] E.B.Lv, X.S.Liu, Study on the factors of metal Sm by La and Ce thermal reduction method,J.Jiangxi.Nonferr.Metal. 4(1990) 9-13
Online since: July 2014
Authors: Ri Sheng Huang
It made the manifold learning algorithms that aims at seeking inner structure information in high dimensional data can be used in nonlinear dimensionality reduction for speech feature data, such as lower dimensional speech for visualization [2] and speech recognition [3].
data points equal to .
Step 2: partition training sample data: 50% for training, training data equals to ; 50% for testing, test data equals to .
Experiment: Don’t perform any dimensionality reduction on the extracted original 48D speech feature data, and does the emotion recognition experiment directly.
Dimensionality reduction for visualization of normal and pathological speech data.
data points equal to .
Step 2: partition training sample data: 50% for training, training data equals to ; 50% for testing, test data equals to .
Experiment: Don’t perform any dimensionality reduction on the extracted original 48D speech feature data, and does the emotion recognition experiment directly.
Dimensionality reduction for visualization of normal and pathological speech data.