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Online since: January 2016
Authors: Agus Sunjarianto Pamitran, Muhammad Idrus Alhamid, Nasruddin Nasruddin, Samuel Agustinus Adam
This causes a reduction in heat transfer that has a negative impact on performance of engine.
Data Reduction The inlet and outlet temperature in heat exchanger is calculated using the LMTD method and ε-NTU method.
According to Biomass Energy Data Book – 2011 [4] it is known that the lower heating value for the diesel fuel is 42,791 kJ/kg, and for diesel fuel density is ranged between 0.82-0.87 kg/l.
With the known data above the value of kH can be found with the following equation: kH= 142,791.1.110.85=3.05.10-5 (15) Table 3.
[4] Biomass, Energy Data Book, 2011
Data Reduction The inlet and outlet temperature in heat exchanger is calculated using the LMTD method and ε-NTU method.
According to Biomass Energy Data Book – 2011 [4] it is known that the lower heating value for the diesel fuel is 42,791 kJ/kg, and for diesel fuel density is ranged between 0.82-0.87 kg/l.
With the known data above the value of kH can be found with the following equation: kH= 142,791.1.110.85=3.05.10-5 (15) Table 3.
[4] Biomass, Energy Data Book, 2011
Online since: August 2012
Authors: Tomasz Giesko, Sławomir Bujnowski, Zbigniew Lutowski, Tomasz Marciniak, Dariusz Boroński
Measurement of small displacements, which later provides basis for determination of strains, requires the use of very high resolution digital video cameras and this involves the necessity of transmission and processing of huge amount of data in a very short time.
Additionally long lasting cyclical loads involve a significant increase in the amount of data to be processed with further reduction of the analysis time and a considerably higher probability of the method de-correlation.
An increased image resolution and the usage the digital image transmission systems involves the necessity of transmitting a huge amount of data in a very short time.
The last phase of the algorithm optimisation involved the use of textures memory for storing the pattern and searched images data.
Further reduction of the analysis time is possible for GPU cards with a higher number of cores.
Additionally long lasting cyclical loads involve a significant increase in the amount of data to be processed with further reduction of the analysis time and a considerably higher probability of the method de-correlation.
An increased image resolution and the usage the digital image transmission systems involves the necessity of transmitting a huge amount of data in a very short time.
The last phase of the algorithm optimisation involved the use of textures memory for storing the pattern and searched images data.
Further reduction of the analysis time is possible for GPU cards with a higher number of cores.
Online since: March 2014
Authors: Nikolai Kashaev, Volker Ventzke, Anne Groth, Manfred Horstmann, Stefan Riekehr, Josephin Enz, Sergey Chupakhin
The key factor for the application of laser-welded AA2198 structures is the availability of reliable data for the assessment of their damage tolerance behavior.
Newly developed Al-Li alloys of the 2xxx series, such as AA2196 and AA2198, with a higher structural efficiency index due to their high strength and lower density can significantly contribute to the further weight reduction of airplanes.
Whereas some data are available on friction stir-welded butt joints [7-11] and laser beam-welded T-joints [1, 4, 12-13], data on laser beam–welded stiffened panels are lacking [15].
Mechanical properties The tensile test results for butt joints and hoop-stress test results for T joints show that there is a reduction of the ultimate tensile strength of approximately 25 % due to LBW (Figs. 4a and 4b).
A reduction of 25 % for the fatigue limit of the as-welded material (150 MPa) relative to the BM tested in the T-direction (200 MPa) can be seen.
Newly developed Al-Li alloys of the 2xxx series, such as AA2196 and AA2198, with a higher structural efficiency index due to their high strength and lower density can significantly contribute to the further weight reduction of airplanes.
Whereas some data are available on friction stir-welded butt joints [7-11] and laser beam-welded T-joints [1, 4, 12-13], data on laser beam–welded stiffened panels are lacking [15].
Mechanical properties The tensile test results for butt joints and hoop-stress test results for T joints show that there is a reduction of the ultimate tensile strength of approximately 25 % due to LBW (Figs. 4a and 4b).
A reduction of 25 % for the fatigue limit of the as-welded material (150 MPa) relative to the BM tested in the T-direction (200 MPa) can be seen.
Online since: October 2010
Authors: Qing Xuan Jia, Xin Yi Zhang, Jian Ping Liu
In this model input data come directly from
rheological experiments or are derived from other measurements through physical relationships.
The central film thickness which separates the contacting surfaces is given by the isothermal EHL formulas of Hamrock-Dowson [5]. )61.01( 69.2 73.0 067.053.067.0 K c e WGUH − − − = (1) The isothermal EHL film thickness is corrected by a thermal reduction factor Tφ proposed by Hsu and Lee [6] to account for the fluid heating in the inlet region. 1875.0527.0447.0687.0 ) 0766.01( − ⋅+= S T eLWG φ (2) Where Gand Ware the material parameter and the load parameter, respectively.
This is the results of lubricant's non-Newtonian property and the reduction of lubricant viscosity for friction heat.
The central film thickness which separates the contacting surfaces is given by the isothermal EHL formulas of Hamrock-Dowson [5]. )61.01( 69.2 73.0 067.053.067.0 K c e WGUH − − − = (1) The isothermal EHL film thickness is corrected by a thermal reduction factor Tφ proposed by Hsu and Lee [6] to account for the fluid heating in the inlet region. 1875.0527.0447.0687.0 ) 0766.01( − ⋅+= S T eLWG φ (2) Where Gand Ware the material parameter and the load parameter, respectively.
This is the results of lubricant's non-Newtonian property and the reduction of lubricant viscosity for friction heat.
Online since: October 2015
Authors: Janusz Grabara, Stefan Nowak, Bartłomiej Okwiet, Radu Sorin Mihai
The data inconsistency is the result of how the information applications have been developed.
Solving the inconsistency of data involves: the identification of possible discrepancies and conflicts (the discrepancies in the data appear due to differently representing similar data in different systems, which may lead to conflicts.
An alternative to such situations would be the inclusion into the logic of accessing the data of an application from other applications, respectively into the logic of migration of data from one application into another, of mechanisms to deal with conflicts.
This solution is easy to implement, because it requires a low abstraction of data and processes.
Thus, the fluidization of the data exchange between the elements of the enterprise's formal structure are thus ensured.
Solving the inconsistency of data involves: the identification of possible discrepancies and conflicts (the discrepancies in the data appear due to differently representing similar data in different systems, which may lead to conflicts.
An alternative to such situations would be the inclusion into the logic of accessing the data of an application from other applications, respectively into the logic of migration of data from one application into another, of mechanisms to deal with conflicts.
This solution is easy to implement, because it requires a low abstraction of data and processes.
Thus, the fluidization of the data exchange between the elements of the enterprise's formal structure are thus ensured.
Online since: June 2013
Authors: Hui Yun Zou, Xi Chen, Bai Lin Liu
Applying Fuzzy Set in Elevator Safety Management Evaluation Method
Bailin Liu 1,a, Huiyun Zou1,b, Xi Chen1,c
1Xi’an Technological University, Xi’an 710032, China
axit.lbl(corresponding author), bzhyyuer2009, czumi20080331@163.com
Keywords: Elevator safety management evaluation; Fuzzy Set; Safety checklist analysis; Risk reduction
Abstract.
The method adopts safety checklist to collect data of elevator safety related conditions, comprehensively considering the importance and influence of every factor, which influences the safety on the basis of the safety checklist analysis and fuzzy set.
The process of outputting remedial suggestions and measures is a typical process of machine learning.Actual data is set to elevator safety evaluation system through the interface, safety evaluation module uses the safety check list analysis and fuzzy mathematical to analyze and handle the elevator data to find out the perfectly matching suggestions and the measures reducing the risk in the knowledge base.
The last total conversion score of the elevator B: 30.6+6.92=37.52 Analyzing data and concluding remedial measures.
The data processing method of the safety assessment in coal mine [J].Journal of Hebei Institute of Technology, 2005, 27(1):11-13.
The method adopts safety checklist to collect data of elevator safety related conditions, comprehensively considering the importance and influence of every factor, which influences the safety on the basis of the safety checklist analysis and fuzzy set.
The process of outputting remedial suggestions and measures is a typical process of machine learning.Actual data is set to elevator safety evaluation system through the interface, safety evaluation module uses the safety check list analysis and fuzzy mathematical to analyze and handle the elevator data to find out the perfectly matching suggestions and the measures reducing the risk in the knowledge base.
The last total conversion score of the elevator B: 30.6+6.92=37.52 Analyzing data and concluding remedial measures.
The data processing method of the safety assessment in coal mine [J].Journal of Hebei Institute of Technology, 2005, 27(1):11-13.
Online since: April 2014
Authors: Ivo Schindler, Stanislav Rusz, Petr Kawulok, Rostislav Kawulok, Miroslava Subíková, Michal Cagala
The castings were rolled to 2/3 of their thickness by 4 reductions with the inter-stage heating, and then annealed at the temperature of 1200 °C in the vacuum furnace for several periods.
These castings were rolled flatways on the laboratory four-high mill stand K350 by 4 reversible height reductions (9% – 9% – 9% – 10%) to nominal thickness of 13.3 mm.
a) uniformity of grain size documented at small magnification b) detail of grains (polarized light, Nomarski prism) Fig. 6 Microstructure of the rolled product subjected to homogenization annealing for 7 hours Average grain size after homogenization annealing of the alloy Fe-40at.% Al-Zr-B is of the order of 10-1 mm, which corresponds more or less with the data in [16] – grain size of approx. 50 µm after recrystallization annealing conducted at relatively low temperature of 900 °C.
The castings were rolled to 2/3 of their thickness by 4 reductions with the inter-stage heating at the temperature of 1200 °C, and then annealed at the same temperature in the vacuum furnace.
These castings were rolled flatways on the laboratory four-high mill stand K350 by 4 reversible height reductions (9% – 9% – 9% – 10%) to nominal thickness of 13.3 mm.
a) uniformity of grain size documented at small magnification b) detail of grains (polarized light, Nomarski prism) Fig. 6 Microstructure of the rolled product subjected to homogenization annealing for 7 hours Average grain size after homogenization annealing of the alloy Fe-40at.% Al-Zr-B is of the order of 10-1 mm, which corresponds more or less with the data in [16] – grain size of approx. 50 µm after recrystallization annealing conducted at relatively low temperature of 900 °C.
The castings were rolled to 2/3 of their thickness by 4 reductions with the inter-stage heating at the temperature of 1200 °C, and then annealed at the same temperature in the vacuum furnace.
Online since: June 2017
Authors: A.S. Yanyushkin, D.V. Lobanov, Vadim Skeeba, Pavel V. Arkhipov
This leads to substantial reduction of cutting power as compared with other methods.
Reduction of efficiency and quality is associated mainly with clogging of the diamond layer by treatment output and, consequently, with loss of cutting capability.
Results and discussion The research and subsequent statistical processing of the data obtained show an adequate mathematical power relation between cutting metal-bonded diamond circles and electric modes of combined electric powered diamond processing.
This leads to substantial reduction of cutting power as compared with other methods.
Reduction of efficiency and quality is associated mainly with clogging of the diamond layer by treatment output and, consequently, with loss of cutting capability.
Results and discussion The research and subsequent statistical processing of the data obtained show an adequate mathematical power relation between cutting metal-bonded diamond circles and electric modes of combined electric powered diamond processing.
This leads to substantial reduction of cutting power as compared with other methods.
Online since: February 2015
Authors: E.M.A. Pereira, J.V. Silva, T.H.F. Andrade, S.R. de Farias Neto, A.G. Barbosa de Lima
To determine the value of mass diffusion coefficient (D) according to the air temperature, was used the Arrhenius equation where the parameters a1= 1.2609 m2/h and b1 = - 5385.9 K were obtained by fitting Eq. 3 to the experimental data reported in the literature [11].
(3) Equilibrium moisture content data is essential for the mathematical description of thin-layer drying.
The values of the mass diffusivity used in Eq. 1 were obtained by two different methods: a) by fitting results obtained of the analytical solution of the mass transport equation based on the Fick's second law, considering 9 terms of the series, to experimental data of the bean grain drying at two air temperature (40 and 60°C) and b) by trial and error method minimizing the least squared error between the experimental and numerical data of the average moisture content using ANSYS CFX®.
Already for D = 3.010 x 10-11m2/s and D = 5.623 x10-11m2/s the numerical drying curves fits well to the experimental data.
The fitted values for the diffusion coefficient D = 3.010x10-11 m2/s and D = 5.623x10-11 m2/s were found after several simulations in Ansys CFX software, by minimizing the sum of squared errors between the experimental and numerical data.
(3) Equilibrium moisture content data is essential for the mathematical description of thin-layer drying.
The values of the mass diffusivity used in Eq. 1 were obtained by two different methods: a) by fitting results obtained of the analytical solution of the mass transport equation based on the Fick's second law, considering 9 terms of the series, to experimental data of the bean grain drying at two air temperature (40 and 60°C) and b) by trial and error method minimizing the least squared error between the experimental and numerical data of the average moisture content using ANSYS CFX®.
Already for D = 3.010 x 10-11m2/s and D = 5.623 x10-11m2/s the numerical drying curves fits well to the experimental data.
The fitted values for the diffusion coefficient D = 3.010x10-11 m2/s and D = 5.623x10-11 m2/s were found after several simulations in Ansys CFX software, by minimizing the sum of squared errors between the experimental and numerical data.
Online since: July 2015
Authors: Robert Prussak, Daniel Stefaniak, Michael Sinapius, Christian Hühne
This paper focuses on the reduction of process-related thermal residual stress in fiber metal laminates and its impact on the mechanical properties.
The reduction of the residual stress leads to an increase in strength.
In addition, the calculated curves by (6) for a metal volume fraction of 65% and material data of Table 1 are presented, which show a good correspondence to the measured values, with a calculated strength increase of 3.6%.
[8] Hexcel, HexPly 8552 Epoxy Matrix - Product Data, 2008
Matsubara, Reduction of thermal residual stress in carbon fiber aluminum laminates using a thermal expansion clamp, Composite Part A: Science and Manufacturing. 42 (2011) 986–992
The reduction of the residual stress leads to an increase in strength.
In addition, the calculated curves by (6) for a metal volume fraction of 65% and material data of Table 1 are presented, which show a good correspondence to the measured values, with a calculated strength increase of 3.6%.
[8] Hexcel, HexPly 8552 Epoxy Matrix - Product Data, 2008
Matsubara, Reduction of thermal residual stress in carbon fiber aluminum laminates using a thermal expansion clamp, Composite Part A: Science and Manufacturing. 42 (2011) 986–992