Sort by:
Publication Type:
Open access:
Publication Date:
Periodicals:
Search results
Online since: December 2011
Authors: Fei Ching Chuang, Ching Tsung Hung
From relevant researches regarding to the evaluation of shipping performance, the methods of evaluation could be classified into two major categories: 1. one was the Financial Ratio Analysis; and other one was the Data Envelopment Analysis, DEA.
This study adopted factor analysis to proceed aspect reduction, and utilized Mean Test to analyze on difference of the financial performance resulted by the global economic crisis.
Empirical proof By considering the access of obtaining research data and scope of companies, this study has selected all the stock market listed shipping corporations in Taiwan as the research object.
Factor analysis During the process of obtaining the factors, this study has taken 6 years period (2001~2006) of data from nine corporations, using 18 financial ratio variables, totaling of 936 variables, to conduct factor analysis.
However, from the data indication, the shipping industries were still influenced by the global economic crisis.
This study adopted factor analysis to proceed aspect reduction, and utilized Mean Test to analyze on difference of the financial performance resulted by the global economic crisis.
Empirical proof By considering the access of obtaining research data and scope of companies, this study has selected all the stock market listed shipping corporations in Taiwan as the research object.
Factor analysis During the process of obtaining the factors, this study has taken 6 years period (2001~2006) of data from nine corporations, using 18 financial ratio variables, totaling of 936 variables, to conduct factor analysis.
However, from the data indication, the shipping industries were still influenced by the global economic crisis.
Online since: December 2018
Authors: Sakari Pallaspuro, Antti Kaijalainen, David A. Porter, Zhi Liang Zhang, Saara Mehtonen, Jukka I. Kömi
These were produced by altering chemical composition, finish rolling temperature and reduction below the non-recrystallization temperature, i.e. austenite pancaking, and characterised in terms of microstructural constituents, grain size distributions, texture and fractography.
The different microstructures were produced by varying the finish rolling temperatures (FRT) both above and below the non-recrystallisation temperature (TNR), i.e. between 950 and 800 °C, and the total rolling reduction of the prior austenite grains (PAG) below TNR, i.e. the level of austenite pancaking (RTOT).
Fig. 3 shows the effect of KId-ref. on the transition temperatures TT with the fitted slope coming from the data of Ref. [5] and the standard deviation bands from the combined data of Hannula et al. [8], Pallaspuro et al. [5,9–11] and Kim et al. [12].
Considering its physical relevance, the fractographic evidence and the data from Kim et al. [12], average cleavage fracture unit size around the brittle fracture initiation sites can also be used in Eq. (1).
For both of these, the standard deviation is 16 °C based on new determinations of d80%, which, in addition to the previous determinations using RD-TD sections, now include data from TD-ND sections in the case of the S960 material.
The different microstructures were produced by varying the finish rolling temperatures (FRT) both above and below the non-recrystallisation temperature (TNR), i.e. between 950 and 800 °C, and the total rolling reduction of the prior austenite grains (PAG) below TNR, i.e. the level of austenite pancaking (RTOT).
Fig. 3 shows the effect of KId-ref. on the transition temperatures TT with the fitted slope coming from the data of Ref. [5] and the standard deviation bands from the combined data of Hannula et al. [8], Pallaspuro et al. [5,9–11] and Kim et al. [12].
Considering its physical relevance, the fractographic evidence and the data from Kim et al. [12], average cleavage fracture unit size around the brittle fracture initiation sites can also be used in Eq. (1).
For both of these, the standard deviation is 16 °C based on new determinations of d80%, which, in addition to the previous determinations using RD-TD sections, now include data from TD-ND sections in the case of the S960 material.
Online since: August 2013
Authors: Tao Lv, Peter Kuschk, Shu Biao Wu, Li Chen, Ren Jie Dong
A better oxygenated condition for the floating wetland is beneficial to oxidation removal of organic compounds and ammonium, but it may not be good for such reduction processes as denitrification.
Moreover, the uptake of nitrogen by plants contributed to nitrogen removal by only less than 10% in this study (data not shown).
n The high redox condition in the floating wetland inhibited reduction processes, such as denitrification for the removal of nitrate.
n A better oxygenated condition of floating wetland is an advantage for the oxidation removal of organic compounds and ammonium, but it may not be good for reduction processes, such as denitrification.
Ecological Engineering 37: 474-486 [18] Wiessner A, Kappelmeyer U, Kuschk P, Kästner M (2005) Sulphate reduction and the removal of carbon and ammonia in a laboratory-scale constructed wetland.
Moreover, the uptake of nitrogen by plants contributed to nitrogen removal by only less than 10% in this study (data not shown).
n The high redox condition in the floating wetland inhibited reduction processes, such as denitrification for the removal of nitrate.
n A better oxygenated condition of floating wetland is an advantage for the oxidation removal of organic compounds and ammonium, but it may not be good for reduction processes, such as denitrification.
Ecological Engineering 37: 474-486 [18] Wiessner A, Kappelmeyer U, Kuschk P, Kästner M (2005) Sulphate reduction and the removal of carbon and ammonia in a laboratory-scale constructed wetland.
Online since: June 2012
Authors: Bao Rong Hou, Jing Ping Xin, Zhuo Yuan Chen
The EIS data showed that the transition of two time constants corrosion stage to three time constants corrosion stage.
In the cathodic polarization, the oxygen reduction would be the main reaction on the working electrode surface.
Anodic dissolution reaction initiated at the center of the electrolyte droplet and the cathodic reduction reaction occurred preferentially in the surrounding region of the hemispheric electrolyte droplet.
In the cathodic polarization, the oxygen reduction would be the main reaction on the working electrode surface.
Anodic dissolution reaction initiated at the center of the electrolyte droplet and the cathodic reduction reaction occurred preferentially in the surrounding region of the hemispheric electrolyte droplet.
Online since: December 2010
Authors: Hai Biao Wang, Bao Kuan Li, Jian Gang Yao, Hai Xu Yang
According to the analysis of dynamic response data, the lead-core rubber bearings with proper parameters are used to improve the dynamic performance of the structures, the seismic response of the bridge deck and pier would therefore be greatly reduced, the safety and seismic performance of the structure are globally raised, earthquake- resistance could be increased, and rather good economic benefits have been achieved as well.
It suggests that LRB has better seismic reduction effect in large earthquakes.
References [1] Lichu Fan and Zhiqiang Wang : Vibration Engineering .Vol. 12(1999), p.173(In Chinese) [2]Architecture Institute of Japan, in:Design of Isolated structures, Seismological Press, Beijing (2006) [3]Wang Li, in: Study on Shock Reduction Method of Bridges, Northern Jiao Tong University (Beijing 2002) [4] Kai Qi, in: Analysis of Isolation Effect of Lead-rubber Bearing.
It suggests that LRB has better seismic reduction effect in large earthquakes.
References [1] Lichu Fan and Zhiqiang Wang : Vibration Engineering .Vol. 12(1999), p.173(In Chinese) [2]Architecture Institute of Japan, in:Design of Isolated structures, Seismological Press, Beijing (2006) [3]Wang Li, in: Study on Shock Reduction Method of Bridges, Northern Jiao Tong University (Beijing 2002) [4] Kai Qi, in: Analysis of Isolation Effect of Lead-rubber Bearing.
Online since: August 2013
Authors: Yi Yang Wang, Chen Chen Wang
The conclusion can be drawn through the analysis of results and data that the more direct the method of transferring force is, the more stable the structure is.
The reduction of internal force in each bar, especially compression, in Plan I is more obvious than that in Plan II.
Figure 3 : Axial Force State (kN) Without Improvement Plan I Plan II Figure 4 : Axial Force States (kN) With Improvements At the same time, the specific reduction of the axial force and changes of the force state in two fixed ends are shown in Table 4 and Table 5 compared with Plan I and Plan II in the former situations: Table 4 : Reduction of the Axial Force in Each Bar Situation Number Axial Force (kN) 1 2 3 4 5 6 7 7 -2946.4482 -1139.0220 -1023.3757 -1002.3130 -724.9213 -2.6484 0.8973 8(Plan I) -2024.7368 -1013.9600 -1006.3645 -1000.0317 -10.4430 -0.4396 0.0924 9(Plan II) -4018.7798 -1017.3865 -1006.8328 -1000.0952 -1424.8760 -2.4035 1.1488 Situation Number Axial Force (kN) 8 9 10 11 12 13 (Plan I) 13 (Plan II) 7 -0.1585 -1078.0825 -885.5083 -988.8884 -997.6874 None None 8(Plan I) -0.0127 27.1459 -1010.5691 -1005.8999 -999.9689 -2483.1304 None 9(Plan II) -0.1736 -1974.5790 -1007.1403 -1005.4300 -999.9039 None 2417.8726 Remarks Provide that the
The reduction of internal force in each bar, especially compression, in Plan I is more obvious than that in Plan II.
Figure 3 : Axial Force State (kN) Without Improvement Plan I Plan II Figure 4 : Axial Force States (kN) With Improvements At the same time, the specific reduction of the axial force and changes of the force state in two fixed ends are shown in Table 4 and Table 5 compared with Plan I and Plan II in the former situations: Table 4 : Reduction of the Axial Force in Each Bar Situation Number Axial Force (kN) 1 2 3 4 5 6 7 7 -2946.4482 -1139.0220 -1023.3757 -1002.3130 -724.9213 -2.6484 0.8973 8(Plan I) -2024.7368 -1013.9600 -1006.3645 -1000.0317 -10.4430 -0.4396 0.0924 9(Plan II) -4018.7798 -1017.3865 -1006.8328 -1000.0952 -1424.8760 -2.4035 1.1488 Situation Number Axial Force (kN) 8 9 10 11 12 13 (Plan I) 13 (Plan II) 7 -0.1585 -1078.0825 -885.5083 -988.8884 -997.6874 None None 8(Plan I) -0.0127 27.1459 -1010.5691 -1005.8999 -999.9689 -2483.1304 None 9(Plan II) -0.1736 -1974.5790 -1007.1403 -1005.4300 -999.9039 None 2417.8726 Remarks Provide that the
Online since: July 2015
Authors: A.I. Pankrats, D.A. Velikanov, A.A. Demidov, V.I. Tugarinov, V.L. Temerov
Extensive experimental data on the magnetic properties of PrxY1-xFe3(BO3)4 have been interpreted and good agreement between theory and experiment has been achieved.
Crystals were grown up on seeds in a mode with temperature reduction.
In order to determine the parameters of a crystal-field of PrxY1-xFe3(BO3)4, we have used the experimental data on the temperature dependence of the magnetic susceptibility cс,^с(T) (from 2 to 300 K), magnetization curves Mc,^с(В, T) (up to 50 kOe) and existing information on the structure of the ground multiplet of Pr3+ ion in PrFe3(BO3)4 [4].
The best agreement is achieved for the following sets of the crystal-field parameters (= (x=0.75[x=0.25]), in cm-1): , , , , , . (5) Comparison of the calculation results with experimental data allowed to determine parameters for PrxY1-xFe3(BO3)4 (x=0.75[x=0.25]): the Fe-Fe exchange fields including the intrachain Bdd1 = l1M0 » 438 [386] kOe and interchain Bdd2 = l2M0 » 295 [285] kOe interactions, the f-d exchange field Вfd= lfdM0 » 118 [81] kOe.
Analysis of the experimental data and performed calculations showed, that in Pr0.75Y0.25Fe3(BO3)4 at low temperatures and B = 0, the magnetic moments of the Pr0.75 and Fe-subsystems are oriented along the trigonal axis c (EA state).
Crystals were grown up on seeds in a mode with temperature reduction.
In order to determine the parameters of a crystal-field of PrxY1-xFe3(BO3)4, we have used the experimental data on the temperature dependence of the magnetic susceptibility cс,^с(T) (from 2 to 300 K), magnetization curves Mc,^с(В, T) (up to 50 kOe) and existing information on the structure of the ground multiplet of Pr3+ ion in PrFe3(BO3)4 [4].
The best agreement is achieved for the following sets of the crystal-field parameters (= (x=0.75[x=0.25]), in cm-1): , , , , , . (5) Comparison of the calculation results with experimental data allowed to determine parameters for PrxY1-xFe3(BO3)4 (x=0.75[x=0.25]): the Fe-Fe exchange fields including the intrachain Bdd1 = l1M0 » 438 [386] kOe and interchain Bdd2 = l2M0 » 295 [285] kOe interactions, the f-d exchange field Вfd= lfdM0 » 118 [81] kOe.
Analysis of the experimental data and performed calculations showed, that in Pr0.75Y0.25Fe3(BO3)4 at low temperatures and B = 0, the magnetic moments of the Pr0.75 and Fe-subsystems are oriented along the trigonal axis c (EA state).
Online since: May 2013
Authors: Aniroodha V. Pethkar, Anirudh P. Bhagat
Screening of FeSNPs for dye reduction using methylene blue.
Screening of nanoparticle preparations for reduction of dyes.
The ability of NPs to cause reduction of MB dye was used as a measure of the efficiency of decolorizing dyes by chemical reduction process.
Among the preparations tested, it was found that FeSNPs synthesized in-vacuo and capped with plant derived polymer BP were most efficient (>80 %) in reducing MB compared to other capping agents (efficiency 30-60 %, data not shown.
Removal of Acid Black 1 from solution using selected FeSNPs It was observed that maximum efficiency (85 %) of Acid Black 1 removal was obtained when the concentration of dye was 20 mg/L (data not shown).
Screening of nanoparticle preparations for reduction of dyes.
The ability of NPs to cause reduction of MB dye was used as a measure of the efficiency of decolorizing dyes by chemical reduction process.
Among the preparations tested, it was found that FeSNPs synthesized in-vacuo and capped with plant derived polymer BP were most efficient (>80 %) in reducing MB compared to other capping agents (efficiency 30-60 %, data not shown.
Removal of Acid Black 1 from solution using selected FeSNPs It was observed that maximum efficiency (85 %) of Acid Black 1 removal was obtained when the concentration of dye was 20 mg/L (data not shown).
Online since: October 2006
Authors: A.W. Lees, L. Atepor, Th. Leize, Daniel J. Inman, Matthew P. Cartmell
The
experimentally verified 'Corrected Brinson Model' [4,5] provides fundamental, and accurate
performance data for developing models for integrating SMAs within beams, plates, and shells.
This predicts a 26.2% reduction in the rotor forward-whirl amplitude at resonance, however in practice certain material availability restrictions for the single-ended active bearing meant that 10% less SMA was fitted than was actually modelled.
It is relevant to note that this downshift principally occurs because of the pronounced shift in the resonant point along the frequency axis rather than any significant overall reduction in forward-whirl amplitude at the displaced resonant point.
Specific code was written to do this calculation for blocks of data, and a typical result is given in Fig.4.
Amplitude reductions at the first critical speed of around 5-10% were recorded using this system, noticeably lower than in the open-loop tests performed earlier.
This predicts a 26.2% reduction in the rotor forward-whirl amplitude at resonance, however in practice certain material availability restrictions for the single-ended active bearing meant that 10% less SMA was fitted than was actually modelled.
It is relevant to note that this downshift principally occurs because of the pronounced shift in the resonant point along the frequency axis rather than any significant overall reduction in forward-whirl amplitude at the displaced resonant point.
Specific code was written to do this calculation for blocks of data, and a typical result is given in Fig.4.
Amplitude reductions at the first critical speed of around 5-10% were recorded using this system, noticeably lower than in the open-loop tests performed earlier.
Online since: August 2011
Authors: Shigeki Matsumura, Haruo Houjoh, Kai Feng
The predicted results show good agreement with the experimental data.
Experimental data from a test rig is used to validate the calculation procedure.
Webber [3] developed a mathematical model to calculate the bending deflection of teeth by considering gear teeth as a non-uniform cantilever beam, which has been proved by many other researchers with experimental data [4].
Validation with Experimental Data a) 172 Nm, 1000 rpm b) 245 Nm, 1000 rpm Fig. 4 Experimental validation To validate the proposed model, dynamic behavior of the helical gear pairs is measured using the experimental apparatus as shown in Fig. 3.
Fig. 3 Schematic representation of the text rig The predicted rotational vibration of the driven gear in frequency domain are compared with experimental data, as shown in Fig. 4.
Experimental data from a test rig is used to validate the calculation procedure.
Webber [3] developed a mathematical model to calculate the bending deflection of teeth by considering gear teeth as a non-uniform cantilever beam, which has been proved by many other researchers with experimental data [4].
Validation with Experimental Data a) 172 Nm, 1000 rpm b) 245 Nm, 1000 rpm Fig. 4 Experimental validation To validate the proposed model, dynamic behavior of the helical gear pairs is measured using the experimental apparatus as shown in Fig. 3.
Fig. 3 Schematic representation of the text rig The predicted rotational vibration of the driven gear in frequency domain are compared with experimental data, as shown in Fig. 4.