The Prediction on the Size and Location of Internal Defects of Standing Trees Using Ultrasonic Technology

A new method was proposed to determine the size and location of the internal deficiency of the standing trees using the acoustic velocity of the ultrasonic, and the method was explained in specific on the process of how to put it into practice. Through the comparison of the experiment on defective Dahurian Larch between the ultrasonography and the Resistance Drilling, the results proved that the method was available and concluded the accuracy of this method when testing deficiency. Meanwhile, the average transmission velocity of the ultrasonic in Dahurian Larch was obtained through large amount of experimental data.

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Real-Time Prediction Method for Performance Degradation Trend Based on Reliability Experimental Data

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.321-324.757 ◽

2013 ◽

Vol 321-324 ◽

pp. 757-761 ◽

Cited By ~ 1

Author(s):

Chen Liang Song ◽

Zhen Liu ◽

Bin Long ◽

Cheng Lin Yang

Keyword(s):

Experimental Data ◽

Real Time ◽

Field Data ◽

Prediction Method ◽

Field Method ◽

Performance Degradation ◽

New Method ◽

Time Prediction ◽

Prediction Result ◽

The Relationship

According to the real-time prediction for performance degradation trend, the commonly used method is just based on field data. But this methods prediction result will not be so much ideal when the fitting of degradation trend of field data is not good. To solve the problem, the paper introduces a new method which is not only based on field method but also based on reliability experimental data coming from the history experiment. We use the relationship between the field data and reliability experimental data to get the result of the two kinds of data respectively and then get the weights according to the two prediction results. Finally, the final real-time prediction result for performance degradation tendency can obtain by allocating the weights to the two prediction results.

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A New Method to Assess Ductility of CFT Box Columns with Binding Bars under Axial Compression

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.446-449.78 ◽

2012 ◽

Vol 446-449 ◽

pp. 78-81 ◽

Cited By ~ 1

Author(s):

Yue Ling Long ◽

Jian Cai

Keyword(s):

Experimental Data ◽

Axial Compression ◽

Material Properties ◽

New Method ◽

Box Columns ◽

Good Agreement

A new method based on material properties instead of experimental data was proposed to assess the ductility of concrete-filled steel box columns with binding bars and those without binding bars. Comparison between ductility coefficients based on experimental data and the calculated values by the proposed method shows good agreement.

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A new method of determining the transport coefficients for high pressure arcs from experimental data

Journal of Plasma Physics ◽

10.1017/s0022377800004360 ◽

1969 ◽

Vol 3 (2) ◽

pp. 269-280 ◽

Cited By ~ 4

Author(s):

L. B. Kapp ◽

P. H. Richards

Keyword(s):

Experimental Data ◽

High Pressure ◽

Computer Program ◽

Numerical Method ◽

Temperature Profile ◽

Transport Coefficients ◽

New Method ◽

Radial Temperature ◽

Current Voltage ◽

Current Voltage Characteristics

The problem is to determine the electrical and thermal conductivities of high pressure are plasmas from measurements of the current—voltage characteristics of the are and a single radial temperature profile. A new numerical method is described together with the corresponding computer program. The latter is applied to some recent measurements on wall-stabilized nitrogen ares, covering the temperature range 4500—11,000 °K, for which radiation can be neglected, and the results are compared with those of other workers.

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Evaluating timber quality in larger-diameter standing trees: rethinking the use of acoustic velocity

Holzforschung ◽

10.1515/hf-2018-0232 ◽

2019 ◽

Vol 73 (9) ◽

pp. 797-806 ◽

Cited By ~ 3

Author(s):

Luka Krajnc ◽

Niall Farrelly ◽

Annette M. Harte

Keyword(s):

Mechanical Properties ◽

Bending Strength ◽

Small Diameter ◽

Longitudinal Direction ◽

High Ratio ◽

Acoustic Velocity ◽

Timber Quality ◽

Standing Trees ◽

The Mean ◽

Acoustic Velocities

AbstractThe use of acoustic velocity for different purposes is becoming widespread in the forestry industry. However, there are conflicting reports on how well this technology reflects the mechanical properties of trees. In this study, the prediction of timber quality using acoustic technology was evaluated on mature standing trees of three softwood species. The velocity in 490 standing trees was measured in several directions (longitudinal, radial and tangential). A sub-sample of trees was felled and the acoustic velocity was measured in 120 logs which were then sawn into structural-sized timber. A total of 1383 boards were tested for bending, as were small clear specimens extracted from the structural-sized boards. The mean tree values of the timber grade-determining properties (elastic modulus, bending strength and density) of both specimen sizes were related to the acoustic velocities and tree slenderness. The correlations between the mean tree mechanical properties and acoustic velocities were relatively low, most likely due to a high ratio of diameter to measurement distance. The transverse directions showed similar correlations with mechanical properties in larger-diameter trees to the longitudinal direction, as did tree slenderness. The results suggest that while the acoustic velocity in the longitudinal direction can reflect the mean tree mechanical properties in small-diameter trees, alternatives are needed to achieve the same in larger-diameter trees.

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Feature-Section-Criterion for Predicting Lean Blowout and Comparison Research

Volume 2: Heat Transfer Enhancement for Practical Applications; Heat and Mass Transfer in Fire and Combustion; Heat Transfer in Multiphase Systems; Heat and Mass Transfer in Biotechnology ◽

10.1115/ht2013-17229 ◽

2013 ◽

Author(s):

Zhibo Zhang ◽

Hongtao Zheng ◽

Honglei Yang ◽

Ren Yang ◽

Qian Liu ◽

...

Keyword(s):

Experimental Data ◽

Flow Field ◽

New Method ◽

Engineering Applications ◽

Lean Blowout ◽

Comparison Research ◽

Annular Combustor ◽

Combustion Flow ◽

Feature Section

Lean blowout (LBO) plays an important role in combustor performance. A new method named Feature-Section-criterion (FSC) for predicting the LBO of annular combustor has been put forward and expounded in this paper. A CFD software FLUENT has been used to simulate the combustion flow field of an annular combustor. The process of blowout and effects of flow split among swirlers and primary holes have been researched by using of FSC. The result shows that the predictions of FSC are in agreement with corresponding experimental data. So this method for predicting lean blowout is reliable and can be used for engineering applications.

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Détermination directe des coefficients du potentiel de Dunham par une méthode de moindres carrés non linéaire appliquée aux nombres d'ondes des raies. Application au cas de la molécule HBr

Canadian Journal of Physics ◽

10.1139/p77-222 ◽

1977 ◽

Vol 55 (21) ◽

pp. 1829-1834 ◽

Cited By ~ 27

Author(s):

P. Niay ◽

P. Bernage ◽

C. Coquant ◽

A. Fayt

Keyword(s):

Experimental Data ◽

Least Squares ◽

Iterative Process ◽

Nonlinear Least Squares ◽

Theoretical Framework ◽

New Method

In this paper, the Dunham potential coefficients are numerically determined by using a nonlinear least squares routine applied directly to the line experimental wave numbers.The results are compared to the ones obtained when using the usual iterative process applied to the H81Br Yi0 and Yi1 equilibrium constants.The al determination new method assumes a theoretical framework (B.O., adiabatic or non-adiabatic) to be valid. One can test this assumption by comparing the experimental data to the calculated ones.

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Analysis of the Elastic Wave Behavior in a Cracked Shaft

Volume 1: 21st Biennial Conference on Mechanical Vibration and Noise, Parts A, B, and C ◽

10.1115/detc2007-35305 ◽

2007 ◽

Cited By ~ 1

Author(s):

Kelsen LaBerge ◽

Maurice Adams

Keyword(s):

Crack Detection ◽

Acoustic Velocity ◽

New Method ◽

Proof Of Concept ◽

Test Apparatus ◽

Rotating Shaft ◽

One Dimensional ◽

Crack Location ◽

The Impact ◽

Cracked Shaft

A new method currently under development for rotating shaft crack detection is presented. The underlying approach is to utilize the impact inherent in the once-per-revolution closing of a shaft crack. The axially traveling elastic compression wave, which is initiated by this impact, propagates to both ends of the shaft at the governing acoustic velocity. Provided suitable measurement near the shaft ends can detect the wave’s arrival, then extracting both the crack location and size is thereby feasible. Proof-of-concept for this new method for shaft crack detection utilizes one-dimensional wave propagation simulations and a newly designed test apparatus, which are presented.

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Optimized reconstruction of the crystallographic orientation density function based on a reduced set of orientations

Journal of Applied Crystallography ◽

10.1107/s1600576719017138 ◽

2020 ◽

Vol 53 (1) ◽

pp. 178-187 ◽

Cited By ~ 1

Author(s):

Abhishek Biswas ◽

Napat Vajragupta ◽

Ralf Hielscher ◽

Alexander Hartmaier

Keyword(s):

Experimental Data ◽

Mechanical Properties ◽

Electron Backscatter Diffraction ◽

Error Function ◽

Plastic Anisotropy ◽

Degree Of Approximation ◽

New Method ◽

Micromechanical Modeling ◽

Data Sets ◽

Cold Forming

Crystallographic textures, as they develop for example during cold forming, can have a significant influence on the mechanical properties of metals, such as plastic anisotropy. Textures are typically characterized by a non-uniform distribution of crystallographic orientations that can be measured by diffraction experiments like electron backscatter diffraction (EBSD). Such experimental data usually contain a large number of data points, which must be significantly reduced to be used for numerical modeling. However, the challenge in such data reduction is to preserve the important characteristics of the experimental data, while reducing the volume and preserving the computational efficiency of the numerical model. For example, in micromechanical modeling, representative volume elements (RVEs) of the real microstructure are generated and the mechanical properties of these RVEs are studied by the crystal plasticity finite element method. In this work, a new method is developed for extracting a reduced set of orientations from EBSD data containing a large number of orientations. This approach is based on the established integer approximation method and it minimizes its shortcomings. Furthermore, the L 1 norm is applied as an error function; this is commonly used in texture analysis for quantitative assessment of the degree of approximation and can be used to control the convergence behavior. The method is tested on four experimental data sets to demonstrate its capabilities. This new method for the purposeful reduction of a set of orientations into equally weighted orientations is not only suitable for numerical simulation but also shows improvement in results in comparison with other available methods.

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The New Method to Separate Stannum and Copper in the Process of Refining Tin

Materials Science Forum ◽

10.4028/www.scientific.net/msf.996.157 ◽

2020 ◽

Vol 996 ◽

pp. 157-164

Author(s):

Bo Zhang ◽

Da Chun Liu ◽

Heng Xiong ◽

Zhen Gen Zhou ◽

Xu Li ◽

...

Keyword(s):

Experimental Data ◽

Experimental Study ◽

Reaction Temperature ◽

Removal Rate ◽

Human Life ◽

The Other ◽

New Method ◽

Promising Technology ◽

Temperature Time ◽

Sulfiding Agent

As the ancient metal, Sn is widely used in all aspects of human life. Nowadays, S, as the vulcanizing agent, is used in the process of refining tin to separate Cu and Sn. However, there are few reports about the other agent of removing copper from stannum. In this study, SnS, a new sulfiding agent to separate Cu and Sn, was investigated. During the process, SnS replaces the combination of Sn and Cu. The variables considered in the experimental study were reaction temperature, time and the ratio of reactants. The experimental data indicated under certain conditions, the removal rate of Cu reach 94.3%. At last, we studied the vacuum reaction of Cu2S and Sn, results indicated that under appropriate conditions, the Cu is detected. The SnS is formed. And after the vacuum reaction, the SnS could be used recycling. This work presented a promising technology for separating Cu from tin.

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