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Online since: May 2009
Authors: H.M. Lu
Noted that the structures of Be and Mg, Na, Al and Au belong to hcp, bcc and fcc structures,
respectively.
Dean: Lange's Handbook of Chemistry (McGraw-Hill Book, New York 1985)
Dean: Handbook of Organic Chemistry (McGraw-Hill Book, New York 1987) [66] R.
C.Weast: Handbook of Chemistry and Physics (CRC Press Inc, Cleveland 1988-1989)
[67] http://webbook.nist.gov/chemistry [68] H.M.
Dean: Lange's Handbook of Chemistry (McGraw-Hill Book, New York 1985)
Dean: Handbook of Organic Chemistry (McGraw-Hill Book, New York 1987) [66] R.
C.Weast: Handbook of Chemistry and Physics (CRC Press Inc, Cleveland 1988-1989)
[67] http://webbook.nist.gov/chemistry [68] H.M.
Online since: September 2012
Authors: Jin Lian Hu, Jing Lu
Mondal, Mini-Reviews in Organic Chemistry 2009, 6, 114
[13] S.
Smart Materials & Structures, 2006. 15(5): p. 1385-1394
Smart Materials & Structures, 2007. 16(3): p. 830-836
Smart Materials & Structures, 2007. 16(3): p. 748-753
Smart Materials & Structures, 1996. 5: p. 483-491
Smart Materials & Structures, 2006. 15(5): p. 1385-1394
Smart Materials & Structures, 2007. 16(3): p. 830-836
Smart Materials & Structures, 2007. 16(3): p. 748-753
Smart Materials & Structures, 1996. 5: p. 483-491
Online since: December 2016
Authors: Luboš Sibilla, Marie Rusinová, Romana Benešová
The expression “Fire resistance of structures” means the time given in minutes, after which the structure is able to maintain its function even when the fire load.
This coating is delaying the beginning of burning of wooden structure and slows the spread of fire to other parts of the truss structure.
„Structure covered with deceleration coating may not be subsequently covered by another structure, because the intumescent coating needs a sufficient space for creating the protective foam and any other structures would limit space to create a foam.“ [9].
The structure of the foam is dependent on the conditions in the burning area- temperature, humidity and the fact that the structure is exposed to direct flame.
, In: Fire Retardancy of Polymers : New Strategies and Mechanisms, Royal Society of Chemistry, Cambridge, 2009, pp. 240–252
This coating is delaying the beginning of burning of wooden structure and slows the spread of fire to other parts of the truss structure.
„Structure covered with deceleration coating may not be subsequently covered by another structure, because the intumescent coating needs a sufficient space for creating the protective foam and any other structures would limit space to create a foam.“ [9].
The structure of the foam is dependent on the conditions in the burning area- temperature, humidity and the fact that the structure is exposed to direct flame.
, In: Fire Retardancy of Polymers : New Strategies and Mechanisms, Royal Society of Chemistry, Cambridge, 2009, pp. 240–252
Online since: October 2014
Authors: Ji Cai Qiu, Ren Jun Liang, Xiao Tian Ma
Heavy Metals (Fe, Zn, Mn, Cr, As) Speciation Analysis and Ecological Risk Assessment in the Surface Sediments of WuHe Wetland
Renjun Liang1, a, Xiaotian Ma 2,3,b and Jicai Qiu4,c
1,2,4Linyi University,Linyi Shandong China
3Shandong Normal University,Jinan Shandong China
aliangrenjun@lyu.edu.cn , b906351558@qq.com, cqiujicai@126.com
Keywords: WuHe wetland;heavy metal pollution;morphological structure analysis;potential ecological risk
Abstract:This study assessed the ecological risk associated with heavy metals in surface sediments in a specific setting: the Wuhan wetland.
[6] Wangqiang Jin,Zhongren Nan,Xiaowen Liu,et al:Environmental Chemistry.Vol.29(2010),p. 220-225, In Chinese
[6] Wangqiang Jin,Zhongren Nan,Xiaowen Liu,et al:Environmental Chemistry.Vol.29(2010),p. 220-225, In Chinese
Online since: July 2011
Authors: Pei Lin Duan, Shi Jun Chen
So, it is studied that a low melting point, good conductivity and thermal conductivity metal is filled in the framework which is made by another high melting point metal to form a pseudo alloy (It always results from that the different crystal structures of the two metals can not dissolve to form a real alloy.).
Figure 2 Cu-W alloy metallurgical structure (a) wetting (b) non-wetting Figure 3 Capillary phenomenon The application of the wettability of liquid-solid in the manufacture of Cu-W alloy end with a groove The conventional process of making Cu-W alloy with a groove As figure 4, showing a basic shape of Cu-W alloy with a groove, the stria’s wide is about 1mm, its depth is above 10 mm.
Contact point structure Contact point is pseudo alloy composed of silver and other metallic oxide.
[2] CHENG Lan-zheng,ZHANG Yan-hao.Physical Chemistry[M] .Shanghai Science and Technology Press,1988
Figure 2 Cu-W alloy metallurgical structure (a) wetting (b) non-wetting Figure 3 Capillary phenomenon The application of the wettability of liquid-solid in the manufacture of Cu-W alloy end with a groove The conventional process of making Cu-W alloy with a groove As figure 4, showing a basic shape of Cu-W alloy with a groove, the stria’s wide is about 1mm, its depth is above 10 mm.
Contact point structure Contact point is pseudo alloy composed of silver and other metallic oxide.
[2] CHENG Lan-zheng,ZHANG Yan-hao.Physical Chemistry[M] .Shanghai Science and Technology Press,1988
Online since: January 2011
Authors: Xiao Ping Hu, Yun Feng Lin
It combines electronics, mechanics, chemistry, physics, mathematics, optics, computers and other multi-discipline knowledge, which covers a very broad.
Can be assessed according to the structure and function decentralized, and it can cause problems because all the relevant factors and dismembered.
Mechanical device in principle, structure, function and processing technology so there are different types of similarity.
For example, a familiar rolling mill engineers to switch fault diagnosis fault diagnosis in steam turbine thermal power generation, and if he can find the mill and the steam turbine in the structure, power and so many similarities, he can quickly experience of the past success applied to new areas of work.
Can be assessed according to the structure and function decentralized, and it can cause problems because all the relevant factors and dismembered.
Mechanical device in principle, structure, function and processing technology so there are different types of similarity.
For example, a familiar rolling mill engineers to switch fault diagnosis fault diagnosis in steam turbine thermal power generation, and if he can find the mill and the steam turbine in the structure, power and so many similarities, he can quickly experience of the past success applied to new areas of work.
Online since: December 2011
Authors: Feng Wu, Lin Jing Zhang, Bo Rong Wu, Ning Li
LiFePO4 with the olivine structure is composed of LiO6, FeO6 octahedra and PO4 tetrahedra [11].
The pH values of the supernatants were measured by pH chemistry paper.
All the patterns corresponded to the olivine structure.
The results indicated that synthesis conditions were significant for the morphology and electrochemical properties of LiFePO4 with olivine structure.
The pH values of the supernatants were measured by pH chemistry paper.
All the patterns corresponded to the olivine structure.
The results indicated that synthesis conditions were significant for the morphology and electrochemical properties of LiFePO4 with olivine structure.
Online since: March 2010
Authors: Min Hao Zhu, J. Luo, Y.D. Wang, C. Song, J.L. Mo
Introduction
It is well known that fretting is caused by the relative oscillatory movement of small amplitude
which may occur between contacting surfaces subjected to vibration, especially for fasteners
subjected to structure oscillating and alternating loading, which may lead to service failure due to
rapid crack formation and surface wear [1-4].
There are at least five mechanisms for alleviating fretting damage by using surface engineering technologies: (1) introducing a residual compressive stress; (2) decreasing coefficient of friction; (3) increasing surface hardness; (4) changing the surface chemistry properties; (5) changing surface roughness; (6) decreasing tangential stiffness [12].
The surface of nitrided layer with the surface roughness Ra=0.22 µm presented in porous structure and columnar morphology.
The reason for the porous structure is the formation of molecular nitrogen [19, 20].
There are at least five mechanisms for alleviating fretting damage by using surface engineering technologies: (1) introducing a residual compressive stress; (2) decreasing coefficient of friction; (3) increasing surface hardness; (4) changing the surface chemistry properties; (5) changing surface roughness; (6) decreasing tangential stiffness [12].
The surface of nitrided layer with the surface roughness Ra=0.22 µm presented in porous structure and columnar morphology.
The reason for the porous structure is the formation of molecular nitrogen [19, 20].
Online since: August 2014
Authors: Dang Sheng Xiong, Jun Liu, Bin Li
Energy-absorbing materials and structures have a number of potential applications, such as vehicles, ballistic armor, blast protection to helmets, sporting equipment and clothing [1, 2].
This structure effectively reduces sedimentation problems that are typically encountered in MRF based damper applications.
McKnight[23] applied inorganic-organic sol-gel chemistries to develop silane-based glass fiber sizings that possess increased nano-surface roughness in comparison to standard commercially produced glass fibers, which can be an inherent “viscoelastic switch” at the fiber-matrix interphase and yield strong fiber-matrix interactions at low strain rates and weak fiber-matrix interactions at high strain rates.
Ashby: Cellular Solids: Structure and Properties (Cambridge University Press, Cambridge 1997)
This structure effectively reduces sedimentation problems that are typically encountered in MRF based damper applications.
McKnight[23] applied inorganic-organic sol-gel chemistries to develop silane-based glass fiber sizings that possess increased nano-surface roughness in comparison to standard commercially produced glass fibers, which can be an inherent “viscoelastic switch” at the fiber-matrix interphase and yield strong fiber-matrix interactions at low strain rates and weak fiber-matrix interactions at high strain rates.
Ashby: Cellular Solids: Structure and Properties (Cambridge University Press, Cambridge 1997)
Online since: April 2009
Authors: Rajshree B. Jotania, Chetna Chauhan, Shobhana Menon, Kanti Jotania
Structural and Magnetic properties of BaMg2Fe10O19 hexaferrite particles
Rajshree Jotania
1, a*
, Chetna Chauhan1, b, Shobhana Menon2, c
,
Kanti Jotania
3,d
.
1
Department of Physics, School of Sciences, Gujarat University, Ahmedabad 380 009, India.
2
Department of Chemistry, School of Sciences, Gujarat University, Ahmedabad 380 009, India.
3
Department of Physics, Faculty of Science, The M.
The crystal structure of BaFe12O19 (space group P63/mmc) is described as SRS*R*, where R is a three layer block (O4 - BaO3 -O4) with composition BaFe6O112and S is a spinel like two layer block (O4 -O4) with composition Fe6O82+.
In this structure the smaller iron cations are distributed within five different kinds of sites (Three Octahedral - 12k, 2a, 4f2, one tetrahedral - 4f and one pseudo tetrahedral trigonal bi pyramidal - 2b).
Lattice volume V of hexagonal crystal is obtained from eq. 2. 1 = 4 (h2+k2+l2) + l2 (1) d2 3 a 2 c 2 V = √3 a 2c (2) 2 Lattice constants and volumes are listed in Table 1. _________________________________________________________________________ Preparation Temperature route conditions a (Ǻ) c (Ǻ) V (Ǻ) _________________________________________________________________________ Stearic acid gel conventional 5.872 23.180 689.79 Microwave 5.939 23.250 710.19 sintering Table 1: Structure Parameters a and c and cell volume V of normal
The crystal structure of BaFe12O19 (space group P63/mmc) is described as SRS*R*, where R is a three layer block (O4 - BaO3 -O4) with composition BaFe6O112and S is a spinel like two layer block (O4 -O4) with composition Fe6O82+.
In this structure the smaller iron cations are distributed within five different kinds of sites (Three Octahedral - 12k, 2a, 4f2, one tetrahedral - 4f and one pseudo tetrahedral trigonal bi pyramidal - 2b).
Lattice volume V of hexagonal crystal is obtained from eq. 2. 1 = 4 (h2+k2+l2) + l2 (1) d2 3 a 2 c 2 V = √3 a 2c (2) 2 Lattice constants and volumes are listed in Table 1. _________________________________________________________________________ Preparation Temperature route conditions a (Ǻ) c (Ǻ) V (Ǻ) _________________________________________________________________________ Stearic acid gel conventional 5.872 23.180 689.79 Microwave 5.939 23.250 710.19 sintering Table 1: Structure Parameters a and c and cell volume V of normal