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Online since: December 2012
Authors: Hui Ming Yang
In this zone the principle of AE generation is that lateral stress reduction result in macro crack propagation, coal mass failure, then elastic wave emitted.
For a more accurate analysis of data, the grid was refined in the coal seam range from 5m to 20m, as shown in Fig.4, 5.
In deeper coal in front of working face, with the reduction of the stress concentration factor, stress gradually reduced to be virginal stress state.
FLAC3D software can calculate stress changes for studying stress field evolution law to provide the data base for the prevention and control of mine dynamic disasters
In this zone the principle of AE generation is that lateral stress reduction result in macro crack propagation, coal mass failure, then elastic wave emitted.
For a more accurate analysis of data, the grid was refined in the coal seam range from 5m to 20m, as shown in Fig.4, 5.
In deeper coal in front of working face, with the reduction of the stress concentration factor, stress gradually reduced to be virginal stress state.
FLAC3D software can calculate stress changes for studying stress field evolution law to provide the data base for the prevention and control of mine dynamic disasters
In this zone the principle of AE generation is that lateral stress reduction result in macro crack propagation, coal mass failure, then elastic wave emitted.
Online since: April 2022
Authors: Claudio Mazzotti, Alessandro Bellini, Andrea Incerti
Furthermore, a comparison with the outcomes emerging from monotonic flexural tests, in terms of maximum flexural capacity and failure mechanisms, will be presented, with the aim of obtaining useful data for assessing the reliability of current design methods and code prescriptions, mainly based on currently available monotonic tests results.
As a general remark, second phase stiffness is similar regardless of the loading procedure adopted, except for G225 panel, where a reduction can be observed in the case of cyclic loading.
If moment decrements registered at the same deflection level are analyzed, after a first significant moment reduction, a progressive attenuation and stabilization of the process can be observed.
As can be observed, cyclic loading causes in general a small capacity reduction, falling within the range 7.6 – 9.7% for glass, aramid-glass and basalt fibers.
As for bond tests, the trend of reduction can be described assuming a nonlinear behavior, with a first larger reduction followed by a progressive attenuation.
As a general remark, second phase stiffness is similar regardless of the loading procedure adopted, except for G225 panel, where a reduction can be observed in the case of cyclic loading.
If moment decrements registered at the same deflection level are analyzed, after a first significant moment reduction, a progressive attenuation and stabilization of the process can be observed.
As can be observed, cyclic loading causes in general a small capacity reduction, falling within the range 7.6 – 9.7% for glass, aramid-glass and basalt fibers.
As for bond tests, the trend of reduction can be described assuming a nonlinear behavior, with a first larger reduction followed by a progressive attenuation.
Online since: November 2005
Authors: Jiri Kliber, Bohuslav Mašek, Ondrej Zacek, H. Staňková
Integral intensities of (200) alpha and (200) gamma reflections were measured for this purpose and
tabulated data was used for calculation.
Upon cooling and holding at 800°C, single-pass rolling was performed with up to four amounts of reduction achieved (due to the steps on specimens).
There was a considerable bainite volume fraction drop as well as a decrease of the amount of residual austenite occurred at twelve reductions from 950 - 600°C.
Effects of extreme austenitization temperatures and reduction of finish forming temperature.
Diagram of the thermomechanical treatment procedure Conclusions • Reduction in the austenitizing temperature results in change of bainite morphology.
Upon cooling and holding at 800°C, single-pass rolling was performed with up to four amounts of reduction achieved (due to the steps on specimens).
There was a considerable bainite volume fraction drop as well as a decrease of the amount of residual austenite occurred at twelve reductions from 950 - 600°C.
Effects of extreme austenitization temperatures and reduction of finish forming temperature.
Diagram of the thermomechanical treatment procedure Conclusions • Reduction in the austenitizing temperature results in change of bainite morphology.
Online since: February 2007
Authors: János Vad, Bálint Morlin
The future aim of the
model is to establish guidelines for the following improvement in mineral wool quality: reduction of
the diameter of mineral wool fibers, improvement of the homogeneity of fiber diameter distribution,
and reduction of gravel size.
However, temperature-dependent C and µ data are hardly available in the open literature for rock melts.
The data show a variance, being characteristic for the analogous production technology.
The dF data related to the "peak" is considered as reference value for further processing. lFref was approximated by traditional length measurement. ρref was deduced from traditional mass and volume measurements on a specimen of the raw material.
Table 1 summarizes the technological, reference, and material data, in accordance with the calculations outlined above.
However, temperature-dependent C and µ data are hardly available in the open literature for rock melts.
The data show a variance, being characteristic for the analogous production technology.
The dF data related to the "peak" is considered as reference value for further processing. lFref was approximated by traditional length measurement. ρref was deduced from traditional mass and volume measurements on a specimen of the raw material.
Table 1 summarizes the technological, reference, and material data, in accordance with the calculations outlined above.
Online since: February 2011
Authors: Quan Lin Jin, Yan Shu Zhang
By plotting the data in a T vs.
The deformation condition map By plotting all our data and previous data into a map with and temperature as axes, Fig. 4 was constructed.
As seen, all data consistently fall into three domains.
Fig. 4 Deformation condition map showing the deformation character of present and previous data on CP Ti.
Evidently, the value of 242kJ/mol, reported by Frost and Ashby [3], is consistent with the data presented in Fig. 4.
The deformation condition map By plotting all our data and previous data into a map with and temperature as axes, Fig. 4 was constructed.
As seen, all data consistently fall into three domains.
Fig. 4 Deformation condition map showing the deformation character of present and previous data on CP Ti.
Evidently, the value of 242kJ/mol, reported by Frost and Ashby [3], is consistent with the data presented in Fig. 4.
Online since: January 2019
Authors: Dominik Laner, David Laner, Fritz Kleemann
The results show that production and erection are already very efficient with regard to waste generation and prevention potentials mainly exist in further offcut reduction and optimization in packaging.
However, important measures for waste reduction are related to the easy exchangeability of building components as well as their reusability.
As a basis for LCAs of prefabricated wood components for buildings, Achenbach and Rüter [2] provide extensive data.
Over the initial use period of 50 years, this results in a reduction of waste generation by one third.
Price, Architects’ perspectives on construction waste reduction by design, Waste Management. 28(7) (2008) 1147-1158 [6] C.
However, important measures for waste reduction are related to the easy exchangeability of building components as well as their reusability.
As a basis for LCAs of prefabricated wood components for buildings, Achenbach and Rüter [2] provide extensive data.
Over the initial use period of 50 years, this results in a reduction of waste generation by one third.
Price, Architects’ perspectives on construction waste reduction by design, Waste Management. 28(7) (2008) 1147-1158 [6] C.
Online since: November 2012
Authors: Wen Wei Yu, Xue Tao Wang
And other auxiliary module, data communication, data management, process tracking is need.
Data Communication Module Data communication module of the data communication between uses the corresponding process automation systems and other systems.
Process system to receive data from basic automation real-time automata; the monitors trigger data change HMI is changing information and send data HMI based automation system installation.
Before communication connection is built, data length and data type need defined at first.
There are deviations between setup data and actual data, due to the difference between models and actual conditions.
Data Communication Module Data communication module of the data communication between uses the corresponding process automation systems and other systems.
Process system to receive data from basic automation real-time automata; the monitors trigger data change HMI is changing information and send data HMI based automation system installation.
Before communication connection is built, data length and data type need defined at first.
There are deviations between setup data and actual data, due to the difference between models and actual conditions.
Online since: December 2013
Authors: Ann Lee, Jhao Jinq Goh
The 180̊ out-of-phase jet configuration exhibits higher cooling performance compared to the in-phase jet configuration in terms of the reduction in the maximum temperature in the silicon wafer.
Instantaneous temperature contour plots (xy plane) of in-phase: (i) t” = 10 and out-of-phase: (ii) t” = 10 After running the transient analysis for 40 cycles for both cases, a set of data on the maximum temperature in the silicon wafer after each cycle was obtained and temperature history of the maximum temperature in the silicon wafer is shown in Fig. 4.
At the end of the 40th cycle, the temperature reductions for both in-phase and out-of-phase jet configurations are 24.3K and 28.3K, respectively.
The 180 out-of-phase jet configuration has higher cooling performance and has shown additional 4K temperature reduction in the silicon wafer.
Instantaneous temperature contour plots (xy plane) of in-phase: (i) t” = 10 and out-of-phase: (ii) t” = 10 After running the transient analysis for 40 cycles for both cases, a set of data on the maximum temperature in the silicon wafer after each cycle was obtained and temperature history of the maximum temperature in the silicon wafer is shown in Fig. 4.
At the end of the 40th cycle, the temperature reductions for both in-phase and out-of-phase jet configurations are 24.3K and 28.3K, respectively.
The 180 out-of-phase jet configuration has higher cooling performance and has shown additional 4K temperature reduction in the silicon wafer.
Online since: December 2013
Authors: Pavel Tesárek, Zuzana Rácová, Pavel Padevět, Tomáš Plachy, Ondřej Zobal, Martin Lidmila, Václav Nežerka
The environmental awareness and potential cost reduction have promoted the recycling of materials in civil engineering.
If the removed old sleepers were directly recycled, and used on-site as a material supporting the embankments or improving the subsoil, there would be another cost reduction due to elimination of transport.
This material can be then used as a binder which would bring a significant cost reduction, since the material is only ground and does not require any high-temperature curing (firing) such as conventional Portland cement, which has to be burnt at the temperatures exceeding 1400°C [4].
It is obvious from the measured data that a higher bending and compressive strength can be reached if the recycled concrete samples are cured under water (recycled cement B), see Tab. 1.
If the removed old sleepers were directly recycled, and used on-site as a material supporting the embankments or improving the subsoil, there would be another cost reduction due to elimination of transport.
This material can be then used as a binder which would bring a significant cost reduction, since the material is only ground and does not require any high-temperature curing (firing) such as conventional Portland cement, which has to be burnt at the temperatures exceeding 1400°C [4].
It is obvious from the measured data that a higher bending and compressive strength can be reached if the recycled concrete samples are cured under water (recycled cement B), see Tab. 1.
Online since: October 2016
Authors: Thilo Pirling, Catrin Mair Davies, Wei Zhang, Ran Pan, Zhusheng Shi, Jian Guo Lin
The Effectiveness of Cold Rolling for Residual Stress Reduction in Quenched 7050 Aluminium Alloy Forgings
Ran Pan1,a*, Catrin Mair Davies1,b, Wei Zhang2,c, Zhusheng Shi1,d,
Thilo Pirling3,e and Jian Guo Lin1,f
1Department of Mechanical Engineering, Imperial College London, London SW7 2AZ, UK
2The First Aircraft Institute, No. 1 Renmindong Road, Yanliang District, Xi'an, Shanxi 710089,
P.R.
He found that, although both techniques can remarkably reduce the magnitude of quenching-induced residual stresses (a reduction of around 90%), in practice it is difficult to apply these conventional cold working methods for very large components.
A brief summary of the measurement procedure and data analysis methods are described below.
Cudd, Cold compression residual stress reduction in aluminium alloy 7010, the Fifth European Conference on Residual Stresses, (ECRS5), 347 (1999) 235-240
Robinson, Modelling stress reduction techniques of cold compression and stretching in wrought aluminium alloy products, J.
He found that, although both techniques can remarkably reduce the magnitude of quenching-induced residual stresses (a reduction of around 90%), in practice it is difficult to apply these conventional cold working methods for very large components.
A brief summary of the measurement procedure and data analysis methods are described below.
Cudd, Cold compression residual stress reduction in aluminium alloy 7010, the Fifth European Conference on Residual Stresses, (ECRS5), 347 (1999) 235-240
Robinson, Modelling stress reduction techniques of cold compression and stretching in wrought aluminium alloy products, J.