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Influence of Distance from Blast Center on Time-Frequency Characteristics of Blast Vibration Signals
Online since: October 2014
Authors: Qiang Kang, Xu Guang Wang, En An Chi, Ming Sheng Zhao
Based on the measured data, wavelet analysis was used to decompose the measured signals, and signal segments at different frequency bands were got.
The research results provide the analysis base for understanding the influence of the distance from the blast center on signals’ t-f characteristic and studying vibration resistance and vibration reduction.
This paper, based on the blasting vibration data measured in Jinduicheng Open Pit Mine, studies the blasting vibration signals’ time-frequency characteristics under different distances from blasting center using wavelet analysis and RSPWVD[6].
The research results provide the analysis base for understanding the influence of the distance from the blast center on signals’ t-f characteristic and studying vibration resistance and vibration reduction.
This paper, based on the blasting vibration data measured in Jinduicheng Open Pit Mine, studies the blasting vibration signals’ time-frequency characteristics under different distances from blasting center using wavelet analysis and RSPWVD[6].
Online since: June 2014
Authors: Shao Hua Li, Ying Ying Zhao, Jun Qing Yang, Guo Yan Zhang, Ju Rui Qi
Differential pulse voltammetry (DPV) experiments were performed using an Autolab potentiostat, connected to a PC microcomputer for potential control and data acquisition.
A pair of well-defined redox peaks is observed with oxidation at -0.044 V and reduction at +0.021 V at the MWCNTs-modified GCE (cyclic voltammogram a).
This is owing to the oxidation/reduction of some functional groups on the surface of MWCNTs [7].
At the same experimental conditions, two redox peaks for HQ at bare GC electrode were observed with oxidation at 0.160 V and reduction at 0.210 V.
At the same time, the reduction peak potential shifted negatively with increasing scan rate and oxidation peak potentials shifted positively.
A pair of well-defined redox peaks is observed with oxidation at -0.044 V and reduction at +0.021 V at the MWCNTs-modified GCE (cyclic voltammogram a).
This is owing to the oxidation/reduction of some functional groups on the surface of MWCNTs [7].
At the same experimental conditions, two redox peaks for HQ at bare GC electrode were observed with oxidation at 0.160 V and reduction at 0.210 V.
At the same time, the reduction peak potential shifted negatively with increasing scan rate and oxidation peak potentials shifted positively.
Online since: September 2018
Authors: Michelle Félix de Andrade, Gelsoneide da Silva Gois, Sônia Maria da Silva Garcia, Ivo Diego Lima da Silva, Viviane Fonseca Caetano, Yêda Medeiros Bastos de Almeida, Tomás Jeferson Alves de Melo, Glória Maria Vinhas
The data of the mechanical test were analyzed through the study of variance (ANOVA) using the Statistic software version 10.0.228.8.
The compositions with 10 and 15% of oil there suffered a reduction in the amount of Tc, the addition of limonene favors the increase in mobility of polymer chains, which indicates the formation of plasticizing effect on the polymer, favoring, thus, a decrease in the value of Tc, besides a reduction in the degree of crystallinity [8].
According to the observed values for the specific deformation, there was a reduction in its values at all concentrations.
This behavior is best observed with 10% oil, indicating that this percentage favored larger structural discontinuities and a significant reduction in its deformation.
There was a reduction, however, in fracture stress with increasing oil content and the oil decreased the deformation of the films at all concentrations.
The compositions with 10 and 15% of oil there suffered a reduction in the amount of Tc, the addition of limonene favors the increase in mobility of polymer chains, which indicates the formation of plasticizing effect on the polymer, favoring, thus, a decrease in the value of Tc, besides a reduction in the degree of crystallinity [8].
According to the observed values for the specific deformation, there was a reduction in its values at all concentrations.
This behavior is best observed with 10% oil, indicating that this percentage favored larger structural discontinuities and a significant reduction in its deformation.
There was a reduction, however, in fracture stress with increasing oil content and the oil decreased the deformation of the films at all concentrations.
Online since: March 2025
Authors: Gaurav Kumar, Sudarsan Ghosh, Paruchuri Venkateswara Rao
Previous research is focused on depositing MoS2-based solid lubricant by Physical Vapor Deposition (PVD) on microstructures and such tools exhibited a 25-44 % reduction in cutting forces while machining hardened steel [9].
A 4-component rotary type 9170A dynamometer (Make: Kistler) measures cutting forces and 3 trials per experiment is conducted to ensure the repeatability of the data.
This significant reduction in cutting temperature is due to the smooth flow of the chips over the rake face and adequate lubrication at the machining zone.
This is a significant reduction due to the collective optimized combination of lower cutting forces, lower friction, retention of the sharpness of cutting tool edge, and smooth evacuation of the cutting chips.
· There is a 75.1% reduction in the flank wear of the textured cutting tool compared with the non-textured tool, and the primary wear mechanism observed in the non-textured tool is abrasion, fracturing, and adhesion
A 4-component rotary type 9170A dynamometer (Make: Kistler) measures cutting forces and 3 trials per experiment is conducted to ensure the repeatability of the data.
This significant reduction in cutting temperature is due to the smooth flow of the chips over the rake face and adequate lubrication at the machining zone.
This is a significant reduction due to the collective optimized combination of lower cutting forces, lower friction, retention of the sharpness of cutting tool edge, and smooth evacuation of the cutting chips.
· There is a 75.1% reduction in the flank wear of the textured cutting tool compared with the non-textured tool, and the primary wear mechanism observed in the non-textured tool is abrasion, fracturing, and adhesion
Online since: December 2012
Authors: Huan Wang, Lei Pan
The wind data should be managed with right method; it would affect the results of the wind resources evaluation.
For the wind data management, some rules have prescribed definitely the methods about the wind power resources evaluation.
In general, the wind data includes the validating, correcting and calculation parameter of the wind resources evaluation.
Mardia.Statisties of directional data.
Statisties of direetional data (with discussion).
For the wind data management, some rules have prescribed definitely the methods about the wind power resources evaluation.
In general, the wind data includes the validating, correcting and calculation parameter of the wind resources evaluation.
Mardia.Statisties of directional data.
Statisties of direetional data (with discussion).
Online since: October 2011
Authors: Ting Sun, Xiao Tong Zhang, Chuang Ren, Jing Jing Guo, Li Juan Song
Theory and method
Data Set
Table 1.
into lower dimensions with minimal loss of information.PCA is an important and essential technique for data reduction and feature extraction.
PCA is mostly used for making 2-dimensional plots of the data for visual examination and interpretation.
This article’s MS data comes from the NIST MS Library , which is the most famous MS database , the latest version has already increase 46,078 spectrum data.
Figure.2 demonstrates the plot of the RBF predicted versus the experimental values of the RI for the data set.
into lower dimensions with minimal loss of information.PCA is an important and essential technique for data reduction and feature extraction.
PCA is mostly used for making 2-dimensional plots of the data for visual examination and interpretation.
This article’s MS data comes from the NIST MS Library , which is the most famous MS database , the latest version has already increase 46,078 spectrum data.
Figure.2 demonstrates the plot of the RBF predicted versus the experimental values of the RI for the data set.
Online since: June 2008
Authors: Márton Takács, Ferenc Nemoda
Dosage of superplasticizers based on the
two latter ingredients is 0.3-1.5% by weight of cement content resulting in a water reduction of 20-
40%.
The naphtalene and melamine types of superplasticizers are typically used at 0.7-2.5% by weight of cement and give water reduction of 15-25% [4,5].
There are two basic mechanisms to perform water reduction.
Minimal water reduction of 12% according to the corresponding standard MSZ EN 934-2:2002 was reached by adding superplasticizers of type A, C and D, but only at the highest examined dosage rate (1.50%) (see Table 1.).
Obviously dosage assuring 12% water reduction exactly is falling between 1.00% and 1.50% for all three superplasticizers.
The naphtalene and melamine types of superplasticizers are typically used at 0.7-2.5% by weight of cement and give water reduction of 15-25% [4,5].
There are two basic mechanisms to perform water reduction.
Minimal water reduction of 12% according to the corresponding standard MSZ EN 934-2:2002 was reached by adding superplasticizers of type A, C and D, but only at the highest examined dosage rate (1.50%) (see Table 1.).
Obviously dosage assuring 12% water reduction exactly is falling between 1.00% and 1.50% for all three superplasticizers.
Online since: January 2013
Authors: Yong Li, Jing Bo Liu, Jin Jie Wang
A relative consistency can be captured between the seismic reduction ratio of the moment and the angle with a maximum value of 50% which shows good seismic reduction effect.
The seismic reduction ratios of the moment at the bottom of the piers under longitudinal excitation are within 10% while the deformation reduction ratios are remained within 2%.
However, when the calculated angles are being considered, the plastify condition is relatively insignificant as the piers have just reached the plastic condition under longitudinal excitation. 3.1 Seismic performance of bearings The seismic reduction ratios of the moment and rotation angle of piers seem insignificant when HDR bearings are adapted.
Some conclusions can be drawn as follows: (1) Compared to the bridge with conventional plate RBs, the seismic reduction ratio is insignificant after replaced the plate rubber bearings with HDR isolation bearings as the seismic excitation are distributed according to the stiffness of each piers on the bridge with plate RBs, and the RBs can perform a certain degree of seismic isolating characters which is actually uncontrolled
[5] Muhammad Tariq Amin Chaudhary, Masato Abe´, Yozo Fujino, Performance evaluation of base-isolated Yama-age´ bridge with high damping rubber bearings using recorded seismic data, Engineering Structures, 23, 902-910, 2001
The seismic reduction ratios of the moment at the bottom of the piers under longitudinal excitation are within 10% while the deformation reduction ratios are remained within 2%.
However, when the calculated angles are being considered, the plastify condition is relatively insignificant as the piers have just reached the plastic condition under longitudinal excitation. 3.1 Seismic performance of bearings The seismic reduction ratios of the moment and rotation angle of piers seem insignificant when HDR bearings are adapted.
Some conclusions can be drawn as follows: (1) Compared to the bridge with conventional plate RBs, the seismic reduction ratio is insignificant after replaced the plate rubber bearings with HDR isolation bearings as the seismic excitation are distributed according to the stiffness of each piers on the bridge with plate RBs, and the RBs can perform a certain degree of seismic isolating characters which is actually uncontrolled
[5] Muhammad Tariq Amin Chaudhary, Masato Abe´, Yozo Fujino, Performance evaluation of base-isolated Yama-age´ bridge with high damping rubber bearings using recorded seismic data, Engineering Structures, 23, 902-910, 2001
Online since: April 2016
Authors: Maciej Motyka, Waldemar Ziaja, Jan Sieniawski
It was found that degree of fragmentation of elongated α grains increases with reduction of their width.
Analyse of literature data and own results indicates that heat treatment – particularly β quenching – significantly influences phase constituents morphology in microstructure of Ti-6Al-4V alloy developed in TMP.
Plastic deformation in the α+β↔β phase transformation range (900ºC) was performed in WSK “PZL Rzeszow” S.A. using open die forging process with forging reduction of about 50% (Fig. 1).
Kim at all. [22] showed that σpm increase with reduction of lamella width – particularly in the range of strain rate > 10-3 s-1.
Increase of volume fraction of martensitic α’(α’’) lamellae leads to reduction of secondary αS precipitations after hot forging in microstructure of examined alloy.
Analyse of literature data and own results indicates that heat treatment – particularly β quenching – significantly influences phase constituents morphology in microstructure of Ti-6Al-4V alloy developed in TMP.
Plastic deformation in the α+β↔β phase transformation range (900ºC) was performed in WSK “PZL Rzeszow” S.A. using open die forging process with forging reduction of about 50% (Fig. 1).
Kim at all. [22] showed that σpm increase with reduction of lamella width – particularly in the range of strain rate > 10-3 s-1.
Increase of volume fraction of martensitic α’(α’’) lamellae leads to reduction of secondary αS precipitations after hot forging in microstructure of examined alloy.
Online since: August 2013
Authors: Andrea Bieder, Andreas Biedermann, Christian Jacobi
Fig. 1: Selected low temperature asphalt technologies, according to [2]
During the last years, a number of technologies that allow a significant reduction of the production temperature have emerged: Popular technologies for temperature reduction are based on a combination of the use of foam bitumen, addition of waxes and other agents and changing the mixing sequence.
This parallel reduction of production temperature and compaction temperatures results in a usual compaction time.
A high operational range of the burner is key to using the full potential of temperature reduction
The measured data of four representative points are shown in figures 6 and 7.
This technology allows the reduction of fuel consumption, CO2 emissions on the asphalt plant and emissions on the road construction site.
This parallel reduction of production temperature and compaction temperatures results in a usual compaction time.
A high operational range of the burner is key to using the full potential of temperature reduction
The measured data of four representative points are shown in figures 6 and 7.
This technology allows the reduction of fuel consumption, CO2 emissions on the asphalt plant and emissions on the road construction site.