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Online since: February 2012
Authors: Li Hsing Ho, Wei Feng Kao, Chin Hsin Chiu
They learn about supplementary materials, how to use multimedia teaching equipment, scoring for multiple tasks, classroom management and about the importance of career cram school equipment to have internet capability, sufficient audio-visual equipment, a comfortable learning environment and enough parking space.
One is for skill education and the other is math, science, or to learn other languages.
Most of the schools have high quality teaching materials and increasingly more programs that appeal to persons of high intellect.
International Journal of Educational Development 32, Pp. 46–52.
One is for skill education and the other is math, science, or to learn other languages.
Most of the schools have high quality teaching materials and increasingly more programs that appeal to persons of high intellect.
International Journal of Educational Development 32, Pp. 46–52.
Online since: January 2017
Authors: Ren Li Fu, Fang Yang, Xi Guang Gu
Photoluminescence Properties of SrSi2O2N2 Doped with Divalent Ytterbium Phosphor in Nitrogen-Rich Coordination
Xiguang Gu1,a, Renli Fu1,b, Fang Yang1,c
1College of Material Science and Technology,Nanjing University of Aeronautics and Astronautics, Yudao Street No. 29, Nanjing 210016, PR China
aguxiguang@nuaa.edu.cn, brenlifu@nuaa.edu.cn, cyfangnuaa518@163.com
Keywords: SrSi2O2N2, luminescence properties, nitrogen-rich coordination
Abstract.
As the rare earth doped host materials, the (oxy)nitrides, such as (Ca,Sr,Ba)2Si5N8 [7], (Ca,Sr,Ba)Si2O2N2 [8], SiAlON [9] have attracted more interests due to their excellent thermal and chemical stability.
Among them, SrSi2O2N2 is a potential host material in these (oxy)nitride based phosphors due to its lower synthetic temperature.
Journal of Luminescence. 121 (2006) 441–449 [18] L.
As the rare earth doped host materials, the (oxy)nitrides, such as (Ca,Sr,Ba)2Si5N8 [7], (Ca,Sr,Ba)Si2O2N2 [8], SiAlON [9] have attracted more interests due to their excellent thermal and chemical stability.
Among them, SrSi2O2N2 is a potential host material in these (oxy)nitride based phosphors due to its lower synthetic temperature.
Journal of Luminescence. 121 (2006) 441–449 [18] L.
Online since: January 2021
Authors: Ya Kun Qu, Xiao Guang Zhao, Li Xin Wang, Yu Wu
The exploration and development of novel energy system has been an important direction in the realm of science and technology.
The findings could provide significant theoretical basis for designing new catalytic materials.
Methods All calculations were carried out with the program package in Materials Studio.
Journal of Catalysis, 2014, 317:158-166
The findings could provide significant theoretical basis for designing new catalytic materials.
Methods All calculations were carried out with the program package in Materials Studio.
Journal of Catalysis, 2014, 317:158-166
Online since: August 2011
Authors: Yuan Hao, Ying Ma, Ti Jun Chen, Hai Jun Huang, Yuan Dong Li
Effect of Heat Treatment on Thixoformed AM60B Alloy
Haijun Huanga, Tijun Chenb,*, Ying Ma, Yuandong Li, and Yuan Hao
Key Laboratory of Gansu Advanced Non-ferrous Metal Materials, Lanzhou University of Technology, Lanzhou 730050, China
acornus@163.com, bchentj1971@126.com
* Corresponding author: CHEN Ti-jun; Tel: +86-931-2976573; E-mail: chentj@lut.cn chentj1971@126.com
Keywords: AM60B; Thixoforming; Heat treatment; Microstructure; Kinetics
Abstract.
Stumpf: Open Materials Science Journal.
Stumpf: Open Materials Science Journal.
Online since: March 2006
Authors: Moh. Syaifuddin, Kwang Joon Yoon, Hoon Cheol Park, Nam Seo Goo
., "Trends in Biorobotic Autonomous Undersea Vehicles," IEEE Journal
of Oceanic Engineering, Vol. 29, 2004 (in press)
[3] Dickinson, M.H., Lehmann, F.O., and Sane, S.P., "Wing rotation and the aerodynamics basis of insect flight," Science, Vol. 284, pp.1954-1960, 1999
[5] Park, H.C., Lee, S.Y., Lee, S.K., Yoon, K.J., and Goo, N.S., "Design and demonstration of flapping wing device powered by LIPCA," SPIE's 11th Annual International Symposium on Smart Structures and Material, 14-18 March 2004, San Diego, USA
[6] Park, H.C., Kim, K.J., Lee, S.K., and Chah, Y.J., "Electromechanical flapping produced by ionic polymer-metal composites," SPIE's 11th Annual International Symposium on Smart Structures and Material, 14-18 March 2004, San Diego, USA
[7] Yoon, K.J., Shin, S., Park, H.C., and Goo, N.S., "Design and manufacture of a lightweight piezo-composite curved actuator," Smart Materials and Structures, 10. pp.1-6, 2002
[3] Dickinson, M.H., Lehmann, F.O., and Sane, S.P., "Wing rotation and the aerodynamics basis of insect flight," Science, Vol. 284, pp.1954-1960, 1999
[5] Park, H.C., Lee, S.Y., Lee, S.K., Yoon, K.J., and Goo, N.S., "Design and demonstration of flapping wing device powered by LIPCA," SPIE's 11th Annual International Symposium on Smart Structures and Material, 14-18 March 2004, San Diego, USA
[6] Park, H.C., Kim, K.J., Lee, S.K., and Chah, Y.J., "Electromechanical flapping produced by ionic polymer-metal composites," SPIE's 11th Annual International Symposium on Smart Structures and Material, 14-18 March 2004, San Diego, USA
[7] Yoon, K.J., Shin, S., Park, H.C., and Goo, N.S., "Design and manufacture of a lightweight piezo-composite curved actuator," Smart Materials and Structures, 10. pp.1-6, 2002
Online since: February 2012
Authors: De Sheng Chen, Xue Wen Du
Acknowledgment
This research was supported by Zhejiang Provincial Natural Science Foundation of China (ZJNSF No.
Zheng: Journal of Machine Design.
Su: Mechanics of Materials (People’s Education Press, China 1980), p. 109−110 (In Chinese) [8] J.
Barber: Intermediate Mechanics of Materials (McGraw-Hill Companies, Inc U.K. 2001), p. 440−443 [9] J.
Zheng: Journal of Machine Design.
Su: Mechanics of Materials (People’s Education Press, China 1980), p. 109−110 (In Chinese) [8] J.
Barber: Intermediate Mechanics of Materials (McGraw-Hill Companies, Inc U.K. 2001), p. 440−443 [9] J.
Online since: December 2014
Authors: Chao Liang Ye, Jun Feng Mi, He Song
Because of the distribution symmetry of temperature field, we only take half to analysis.
2.2 The selection of parameters
The thermal physical parameters of material are shown in table 1.
Table 1 The material thermo physical parameters The type of material Temperature(℃) Density (Kg/m³) Thermal conductivity (J/m·℃) Specific heat capacity (J/Kg·℃) Concrete -15 2500 2.56 1390 -10 2500 2.51 1466 -5 2500 2.47 1541 0 2500 2.42 1617 5 2500 2.37 1692 10 2500 2.33 1768 15 2500 2.28 1843 20 2500 2.23 1920 Surrounding rock 2600 1.21 1122 insulation layer 35 0.025 1380 2.3 The initial temperature and boundary conditions Temperature which was applied to the tunnel contour is the temperature that was mensurated in runnel , this temperature can be composed of sine function, the general formula is In the formula, T—temperature,℃; Ta—the annual average temperature,℃; A—annual ranges of temperature,℃; t—time,day.
(c) 2cm insulation layer Figure 1 Temperature distribution image from the tunnel portal 200m 2 From the tunnel portal 400m when there is no insulation layer, the surrounding rock will have trace freezing phenomenon, we can still consider lay 5cm heat insulating material to prevent frostbite. 3 From the tunnel portal 500m when there is no insulation layer, the temperature of surrounding rock is higher than freezing temperature,that is mean surrounding rock will not occur frost damage.
Shanxi Science & Technology of Communications, 2012,(1):80-82
Journal of Xi’an University of Architecture & Technology, 2013,45 (2):158-163
Table 1 The material thermo physical parameters The type of material Temperature(℃) Density (Kg/m³) Thermal conductivity (J/m·℃) Specific heat capacity (J/Kg·℃) Concrete -15 2500 2.56 1390 -10 2500 2.51 1466 -5 2500 2.47 1541 0 2500 2.42 1617 5 2500 2.37 1692 10 2500 2.33 1768 15 2500 2.28 1843 20 2500 2.23 1920 Surrounding rock 2600 1.21 1122 insulation layer 35 0.025 1380 2.3 The initial temperature and boundary conditions Temperature which was applied to the tunnel contour is the temperature that was mensurated in runnel , this temperature can be composed of sine function, the general formula is In the formula, T—temperature,℃; Ta—the annual average temperature,℃; A—annual ranges of temperature,℃; t—time,day.
(c) 2cm insulation layer Figure 1 Temperature distribution image from the tunnel portal 200m 2 From the tunnel portal 400m when there is no insulation layer, the surrounding rock will have trace freezing phenomenon, we can still consider lay 5cm heat insulating material to prevent frostbite. 3 From the tunnel portal 500m when there is no insulation layer, the temperature of surrounding rock is higher than freezing temperature,that is mean surrounding rock will not occur frost damage.
Shanxi Science & Technology of Communications, 2012,(1):80-82
Journal of Xi’an University of Architecture & Technology, 2013,45 (2):158-163
Online since: December 2014
Authors: Yue Feng Zhou, Yu Yu, Bo Jiang, Xiao Jun Zhou
Acknowledgements
This work was financed by the National Natural Science Foundation of China (No.51378436) and the technical development program of the China Railway Corporation (No.2010G018-C-1-3).
Applied Mechanics and Materials, 2014, Vols:580-583, p1096~1099
Journal of Modern Transportation. 2014, 22(1): pp:1-11
Applied Mechanics and Materials, 2013, Vols:353-356, p1321~1324
Applied Mechanics and Materials, 2014, Vols:580-583, p1096~1099
Journal of Modern Transportation. 2014, 22(1): pp:1-11
Applied Mechanics and Materials, 2013, Vols:353-356, p1321~1324
Online since: December 2012
Authors: Lai Jun Sun, Ming Liang Liu, Lu Lu Xu, Xin Fang Li, Xiao Dong Mao
Material and Method
Test Material.
Except for different sedimentation values, the shape, color, weight and other characteristics of grain of wheat of these materials are quite different.
Liaoning Agricultural Science. 9-11 (2005), p. 2, in Chinese
Journal of Instrumental Analysis. 66-69 (2007), p. 1, in Chinese.
Except for different sedimentation values, the shape, color, weight and other characteristics of grain of wheat of these materials are quite different.
Liaoning Agricultural Science. 9-11 (2005), p. 2, in Chinese
Journal of Instrumental Analysis. 66-69 (2007), p. 1, in Chinese.
Online since: May 2011
Authors: Qing Fu Li, Hai Feng Li, Ping Cong, Hong Tao Yang
Table.1 The Weights of Risk Factors from Six Experts
Sequence number
Risk factor
S1
S2
S3
S4
S5
S6
1
Poor construction environment
0.06631
0.08971
0.08148
0.07793
0.07309
0.07236
2
Complex structure and technology
0.04832
0.06696
0.05938
0.0568
0.05327
0.05274
3
Applying new technologies
0.04383
0.04833
0.05386
0.05151
0.04831
0.04783
4
Short construction period
0.05732
0.06325
0.07043
0.06736
0.06318
0.06255
5
Shortage of funds
0.04832
0.04467
0.05938
0.0568
0.05327
0.05274
6
High demand on quality
0.05282
0.05183
0.0649
0.06208
0.05822
0.05765
7
Frequent changes on design
0.09476
0.04783
0.06267
0.06541
0.06526
0.06431
8
Deficiencies in construction organization
0.05486
0.03797
0.03628
0.03787
0.03778
0.03723
9
Weakness in construction technology
0.06925
0.06924
0.07855
0.09137
0.0831
0.08851
10
Delay supply of labours and materials
0.05276
0.04989
0.05985
0.06962
0.06331
0.06744
11
Less input and shortage of safety consciousness
0.04727
0.04965
0.05362
0.06237
0.05672
0.06042
12
Disqualification
Table.3 Combined Weights of Risk Factors Based on the Entropy and Sort of Risk Factors Risk factors Combined weights Eventual sort S1 S 2 S3 S4 S5 S6 Poor construction environment 0.0757 4 6 3 2 3 4 4 Complex structure and technology 0.0553 12 12 5 9 11 12 12 Applying new technologies 0.04919 14 16 12 12 13 14 14 Short construction period 0.06433 6 7 6 5 6 7 7 Shortage of funds 0.05357 13 11 14 10 12 13 13 High demand on quality 0.05878 9 9 7 6 10 9 11 Frequent changes on design 0.06589 5 2 13 7 7 5 6 Deficiencies in construction organization 0.03894 16 8 16 16 16 16 16 Weakness in construction technology 0.08218 2 4 4 3 1 2 2 Delay supply of labours and materials 0.0624 8 10 10 7 4 6 5 Less input and shortage of safety consciousness 0.05628 11 14 11 13 8 10 8 Disqualification of construction equipment 0.05636 10 13 9 14 9 11 9 Omissions of planning and design 0.09966 1 1 1 1 2 1 1 Too many improper administrative interventions 0.07572 3 3 15 4 5 3 3 Poor coordination of design, construction
Acknowledgements This work has been supported by the Program of National Natural Science Foundation of China (50978234).
Yang: submitted to Journal of North China Institute of Water Conservancy and Hydroelectric Power Vol.27 (2006).p.100
Table.3 Combined Weights of Risk Factors Based on the Entropy and Sort of Risk Factors Risk factors Combined weights Eventual sort S1 S 2 S3 S4 S5 S6 Poor construction environment 0.0757 4 6 3 2 3 4 4 Complex structure and technology 0.0553 12 12 5 9 11 12 12 Applying new technologies 0.04919 14 16 12 12 13 14 14 Short construction period 0.06433 6 7 6 5 6 7 7 Shortage of funds 0.05357 13 11 14 10 12 13 13 High demand on quality 0.05878 9 9 7 6 10 9 11 Frequent changes on design 0.06589 5 2 13 7 7 5 6 Deficiencies in construction organization 0.03894 16 8 16 16 16 16 16 Weakness in construction technology 0.08218 2 4 4 3 1 2 2 Delay supply of labours and materials 0.0624 8 10 10 7 4 6 5 Less input and shortage of safety consciousness 0.05628 11 14 11 13 8 10 8 Disqualification of construction equipment 0.05636 10 13 9 14 9 11 9 Omissions of planning and design 0.09966 1 1 1 1 2 1 1 Too many improper administrative interventions 0.07572 3 3 15 4 5 3 3 Poor coordination of design, construction
Acknowledgements This work has been supported by the Program of National Natural Science Foundation of China (50978234).
Yang: submitted to Journal of North China Institute of Water Conservancy and Hydroelectric Power Vol.27 (2006).p.100