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Online since: May 2014
Authors: Suapphong Kritsanawonghong, Pawinee Iamtrakul, Wei Jun Gao, Soichiro Kuroki
From statistical data, the growth rate of convenient stores in Thailand is rapidly increasing [1].
The results from previous study [2] showed that the improvement of store’s envelopes can achieved the reduction of cooling load of the stores up to 10% only.
Table 1 shows the basic data regarding the construction of the store.
Basic information of the convenience store for this study Floor area in sales area / non-sales area 138 m2 / 50 m2 Ceiling height 2.64 m Store’s orientation North Sales area’s envelope materials Clear glass, 10 mm thick Non-sales area’s envelope materials Concrete wall, 100mm thick Roof’s material Metal sheet, 0.5mm thick & PE insulation, 10mm thick Methodology The analysis of the micro co-generation system comparing it to the conventional system was executed based on end-used demand data of hourly electricity energy consumption as illustrated in Fig. 3.
Data assumption for the analysis Fig.4: PES values with various micro-CHP capacities In this study, a micro co-generation system driven by natural gas is considered, combined with the utility electricity and air conditioning system in order to accommodate the energy demands.
The results from previous study [2] showed that the improvement of store’s envelopes can achieved the reduction of cooling load of the stores up to 10% only.
Table 1 shows the basic data regarding the construction of the store.
Basic information of the convenience store for this study Floor area in sales area / non-sales area 138 m2 / 50 m2 Ceiling height 2.64 m Store’s orientation North Sales area’s envelope materials Clear glass, 10 mm thick Non-sales area’s envelope materials Concrete wall, 100mm thick Roof’s material Metal sheet, 0.5mm thick & PE insulation, 10mm thick Methodology The analysis of the micro co-generation system comparing it to the conventional system was executed based on end-used demand data of hourly electricity energy consumption as illustrated in Fig. 3.
Data assumption for the analysis Fig.4: PES values with various micro-CHP capacities In this study, a micro co-generation system driven by natural gas is considered, combined with the utility electricity and air conditioning system in order to accommodate the energy demands.
Online since: July 2013
Authors: Sea Cheon Oh, Tae Gyung Ko, Y. Kim, Woo Teck Kwon, Soo Ryong Kim, Yoon Joo Lee, Ji Yeon Won
Results and discussion
Fig.1 shows the XRD data of the high and low purity silicon kerf.
XRD data confirms that the crystalline phases of two samples are different.
Particle size analysis data of high purity silicon kerf in Fig.5 shows uniform particle size distribution.
Conventional carbothermal reduction of SiO2 for the synthesis of SiC powders involves many steps and is an energy-intensive process [7].
Table 2 The chemical analysis data of SiC powder synthesized at 1300℃ under vacuum condition for 3hrs at various grinding times Particle size (㎛) (Grinding time) SiC Free-Carbon SiO2 Free Si 3.5 (0 h) 96.5 trace 1.19 2.23 1.0 (24 h) 94.6 trace 2.97 2.34 0.5 (120 h) 85.7 trace 5.94 8.12 Summary Characterization of two types (high and low purity) of silicon kerf generated from solar cell manufacturing process was carried out.
XRD data confirms that the crystalline phases of two samples are different.
Particle size analysis data of high purity silicon kerf in Fig.5 shows uniform particle size distribution.
Conventional carbothermal reduction of SiO2 for the synthesis of SiC powders involves many steps and is an energy-intensive process [7].
Table 2 The chemical analysis data of SiC powder synthesized at 1300℃ under vacuum condition for 3hrs at various grinding times Particle size (㎛) (Grinding time) SiC Free-Carbon SiO2 Free Si 3.5 (0 h) 96.5 trace 1.19 2.23 1.0 (24 h) 94.6 trace 2.97 2.34 0.5 (120 h) 85.7 trace 5.94 8.12 Summary Characterization of two types (high and low purity) of silicon kerf generated from solar cell manufacturing process was carried out.
Online since: August 2017
Authors: Khaled Abou-El-Hossein, Abdulqadir N. Lukman, Peter Babatunde Odedeyi, Muhammad M. Liman, Abubakar I. Jumare
The advantages of modern manufacturing process have confirmed the need for automated system over the traditional way of manufacturing in terms of cost reduction, mass production, improved quality, increased competitive advantage, better management control and increased flexibility [1].
The common procedure of machining for TCM was employed for the acquisition of data during the different machining phases.
Pre-processed signals were channeled to the BNC board and to the National Instrument’s (NI) data card for further processing and storage.
The interfacing is done by using LabVIEW graphical data logging software.
Each machining test pass was conducted along the length of the workpiece and the AE data of each pass was recorded (Fig. 1).
The common procedure of machining for TCM was employed for the acquisition of data during the different machining phases.
Pre-processed signals were channeled to the BNC board and to the National Instrument’s (NI) data card for further processing and storage.
The interfacing is done by using LabVIEW graphical data logging software.
Each machining test pass was conducted along the length of the workpiece and the AE data of each pass was recorded (Fig. 1).
Online since: June 2010
Authors: S.H. Raza, W. Akram, M.A. Malik
A finite element procedure is
performed to acquire the data and this data is then correlated with beam theory model for initial
verification.
This data is further evaluated to form the required model for calculating thickness of coating for a beam.
The resulting parametric correlation is verified through comparison with the already published experimental data available in literature.
Data points for the beam with the varying coating thickness are plotted and curve fitting on these VonMises stress data is applied in order to obtain the optimum relation for the coating thickness for the application on the beams.
The empirical relationship developed in this research is verified through comparison with the experimental data published in the literature [10].
This data is further evaluated to form the required model for calculating thickness of coating for a beam.
The resulting parametric correlation is verified through comparison with the already published experimental data available in literature.
Data points for the beam with the varying coating thickness are plotted and curve fitting on these VonMises stress data is applied in order to obtain the optimum relation for the coating thickness for the application on the beams.
The empirical relationship developed in this research is verified through comparison with the experimental data published in the literature [10].
Online since: July 2011
Authors: Jing Bai, Feng Xue, Yang Shan Sun
The need for further weight reduction is expanding the future use of magnesium to critical components such as transmission and engine parts.
Fig. 6 shows the all experimental data logarithmically plotted as strain rate, , versus the normalized stress, (σ/G) in the creep conditions of 175 oC and the applied stress between 50-80MPa.
The plot is shown in Fig. 7 for the data with n = 3.5 taking σ = 70MPa.
Thus a reduction or elimination of the Mg17Al12 volume will lead to improvement in creep resistance.
There is a wide stress ranges at intermediate stresses and a single testing temperature where the datum points usually fall along a line having a slope within the range of ~3 to 6[11].
Fig. 6 shows the all experimental data logarithmically plotted as strain rate, , versus the normalized stress, (σ/G) in the creep conditions of 175 oC and the applied stress between 50-80MPa.
The plot is shown in Fig. 7 for the data with n = 3.5 taking σ = 70MPa.
Thus a reduction or elimination of the Mg17Al12 volume will lead to improvement in creep resistance.
There is a wide stress ranges at intermediate stresses and a single testing temperature where the datum points usually fall along a line having a slope within the range of ~3 to 6[11].
Online since: July 2020
Authors: Pornkiat Churnjitapirom, Sroisiri Thaweboon, Pornrachanee Sawaengkit, Thongchai Poonpiriya
One-way ANOVA and Tukey’s multiple comparison tests at a p<0.05 significance level were used to analyse the data.
Following data collection, statistical analysis was carried out by PASW program (SPSS Inc., Chicago, IL).
The normally distributed data were analysed with one-way ANOVA and Tukey’s multiple comparison tests at a 0.05 significance level.
The reduction in strength can be explained by: 1) the increased amount of filler particles within PMMA resin induce stress concentration and produce change in both flexural modulus and propagation of crack, 2) entrapped air and moisture promote void formation within PMMA resin, 3) cross-section of the load-bearing polymer matrix is reduced, 4) incomplete wetting of the fillers by the resin, and 5) some fillers serve as an foreign particles which affect the structural integrity of PMMA resin.
Following data collection, statistical analysis was carried out by PASW program (SPSS Inc., Chicago, IL).
The normally distributed data were analysed with one-way ANOVA and Tukey’s multiple comparison tests at a 0.05 significance level.
The reduction in strength can be explained by: 1) the increased amount of filler particles within PMMA resin induce stress concentration and produce change in both flexural modulus and propagation of crack, 2) entrapped air and moisture promote void formation within PMMA resin, 3) cross-section of the load-bearing polymer matrix is reduced, 4) incomplete wetting of the fillers by the resin, and 5) some fillers serve as an foreign particles which affect the structural integrity of PMMA resin.
Online since: June 2012
Authors: Muammer Din Arif, A.K.M. Nurul Amin, Suhaily Mokhtar
Vibration data acquisition device and Datalog DasyLab 5.6 software were used to analyze machining vibration.
Germain et al. [14] used Laser Assisted Machining (LAM) of Inconel 718 and obtained significant reduction of cutting force using carbide inserts.
National Instruments Data Acquisition (NI DAQ-9172) device and Datalog DasyLab 5.6 software were used to record and analyze the vibration during the machining operations (Fig. 4).
Fig. 4: Schematics of the data acquisition system Fig. 3: Picture of SEM JSM-T330 Three primary process parameters were chosen: (1) Cutting speed (Vc, m/min), (2) Feed rate (f, mm/tooth), and Depth of cut (DOC, mm).
Germain et al. [14] used Laser Assisted Machining (LAM) of Inconel 718 and obtained significant reduction of cutting force using carbide inserts.
National Instruments Data Acquisition (NI DAQ-9172) device and Datalog DasyLab 5.6 software were used to record and analyze the vibration during the machining operations (Fig. 4).
Fig. 4: Schematics of the data acquisition system Fig. 3: Picture of SEM JSM-T330 Three primary process parameters were chosen: (1) Cutting speed (Vc, m/min), (2) Feed rate (f, mm/tooth), and Depth of cut (DOC, mm).
Online since: April 2023
Authors: Panida Charnkeitkong, Siriporn Sripiboon
The Freundlich isotherm model indicated a good fit with the experimental data for the system studied.
The c2 value has been used to evaluate how fine the model fits the experimental adsorption equilibrium data.
This indicated that the data from Halsay model with the experimental data were not fit well. 6.
This model did not well match to compare with the experimental data with other models. 7.
Data, Vol.65, No.5, (2020), p.2751
The c2 value has been used to evaluate how fine the model fits the experimental adsorption equilibrium data.
This indicated that the data from Halsay model with the experimental data were not fit well. 6.
This model did not well match to compare with the experimental data with other models. 7.
Data, Vol.65, No.5, (2020), p.2751
Online since: December 2012
Authors: Su Hua Li
Yaahp0.5.2 software has been used to conduct the matrix calculation and consistency test, with regard to the data, the pros and cons of each index and comprehensive benefit have been sorted order.
Those independent indexes with representative, certainty and a certain difference have been selected to form the evaluation index system according to professional knowledge, that is, according to the relevant professional theory and practice, to analyze the results of each evaluation while screening evaluation index. 7 77aspects first-grade indexes and a number of second-grade indexes have been determined by the combination of system analysis method and literature data analysis method.
resources should be accomplished by adjusting measures to local conditions and planning as a whole.(3) New energy vehicles standard system with Chinese characteristics should be established as soon as possible, especially in the development of electric vehicles, which should base on the existing technology of the domestic vehicles, a complete standard system with Chinese characteristics in terms of new energy vehicles, parts and infrastructure should be established as soon as possible so as to effectively support the industrialization and commercialization of electric vehicles. (4) Government should further strengthen the role of policy guidance, further increase the support strength of construction of enterprises' production capacityenterprises' production capacity, increase investment in the research and development of key product technology, formulates the stricter economical laws and regulations of vehicles emissions and the fuels, enhance the awareness of energy conservation and emission reduction
Those independent indexes with representative, certainty and a certain difference have been selected to form the evaluation index system according to professional knowledge, that is, according to the relevant professional theory and practice, to analyze the results of each evaluation while screening evaluation index. 7 77aspects first-grade indexes and a number of second-grade indexes have been determined by the combination of system analysis method and literature data analysis method.
resources should be accomplished by adjusting measures to local conditions and planning as a whole.(3) New energy vehicles standard system with Chinese characteristics should be established as soon as possible, especially in the development of electric vehicles, which should base on the existing technology of the domestic vehicles, a complete standard system with Chinese characteristics in terms of new energy vehicles, parts and infrastructure should be established as soon as possible so as to effectively support the industrialization and commercialization of electric vehicles. (4) Government should further strengthen the role of policy guidance, further increase the support strength of construction of enterprises' production capacityenterprises' production capacity, increase investment in the research and development of key product technology, formulates the stricter economical laws and regulations of vehicles emissions and the fuels, enhance the awareness of energy conservation and emission reduction
Online since: October 2006
Authors: Nicolas G. Wright, C. Mark Johnson, Anthony G. O'Neill, Konstantin Vassilevski, Alton B. Horsfall, Praneet Bhatnagar
a
praneet.bhatnagar@ncl.ac.uk, ba.b.horsfall@ncl.ac.uk, cn.g.wright@ncl.ac.uk,
d
c.m.johnson@ncl.ac.uk, ek.v.vassilevski@ncl.ac.uk, fanthony.oneill@ncl.ac.uk
Keywords: Finite element, Analytic, Vertical Junction field effect transistor; Enhancement Mode
Abstract Physics-based analytical models are seen as an efficient way of predicting the
characteristics of power devices since they can achieve high computational efficiency and may be
easily calibrated using parameters obtained from experimental data.
Parameters are extracted from data sheets or from experimental results, which make analytical models more productive compared to finite element based ways of modeling.
Under forward blocking conditions, high drain voltages induce a significant field at the drain end of the channel (shown as AE in Fig.1), which results in reduction of the potential barrier for a given gate voltage, thus increasing the drain current [8].
Parameters are extracted from data sheets or from experimental results, which make analytical models more productive compared to finite element based ways of modeling.
Under forward blocking conditions, high drain voltages induce a significant field at the drain end of the channel (shown as AE in Fig.1), which results in reduction of the potential barrier for a given gate voltage, thus increasing the drain current [8].