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Online since: October 2016
Authors: Takayuki Yanagida
Garnet and sesuquioxide materials are common transparent ceramic materials because they have a simple cubic structure.
Increasing of quadrivalent cations promotes a transformation of original structure to the cubic structure.
Since they can have a cubic structure by selecting the adequate combination of elements, transparent ceramic can be synthesized.
Grimes, Defect chemistry of doped bixbyite oxides, Solid.
Li, Formability of ABO3 cubic perovskites, Journal of Physics and Chemistry of Solids, 69 (2008) 967-974
Increasing of quadrivalent cations promotes a transformation of original structure to the cubic structure.
Since they can have a cubic structure by selecting the adequate combination of elements, transparent ceramic can be synthesized.
Grimes, Defect chemistry of doped bixbyite oxides, Solid.
Li, Formability of ABO3 cubic perovskites, Journal of Physics and Chemistry of Solids, 69 (2008) 967-974
Online since: January 2021
Authors: Siti Unvaresi M. Beladona, Aep Patah, Achmad Rochliadi
MOFs have gained widespread popularity in recent years, because of the noteworthy properties, including open metal sites, large surface area, high porosity, high thermal stability, tunable structure, and feasible in modification.
Using this approach, they were able to deposit stacked biphasic MOF films comprising of two different MOF structures, on the same electrode and in the same solution, by simply changing the electrochemical potential during the synthesis [26].
There are no significant differences in the infrared spectrum collected for the three samples, implying that varying the deposition time does not affect the structure.
Yaghi, The chemistry of CO₂ capture in an amine-functionalized metal-organic framework under dry and humid conditions, J.
Zhu, Molecular engineering for synthesizing novel structure of metal-organic frameworks with multifuntional properties.
Using this approach, they were able to deposit stacked biphasic MOF films comprising of two different MOF structures, on the same electrode and in the same solution, by simply changing the electrochemical potential during the synthesis [26].
There are no significant differences in the infrared spectrum collected for the three samples, implying that varying the deposition time does not affect the structure.
Yaghi, The chemistry of CO₂ capture in an amine-functionalized metal-organic framework under dry and humid conditions, J.
Zhu, Molecular engineering for synthesizing novel structure of metal-organic frameworks with multifuntional properties.
Online since: May 2012
Authors: Xin Gang Zhou, Hua Fang, Jun Yin Yan, Peng Zhu
Reference
[1] Xingang Zhou,Bond Characteristics and Engineering Application Postinstalled Fastenings of Static and Dynamic Behavior of RC.The 13 th national structure engineering structure engineering academic meeting,(2004).
[5] Xingang Zhou, et al.Building Structure,Vol.32 , No.8,38-40(2002).
[6] Deyong Wang.Experimental Study on Inorganic Chemistry Planting-bar Technique.Xian university of science and technology(2007).
[7] Jianrong Zhang.et al.Journal of Building Structures,Vol.26, No.5,96-103(2005).
[8] Zhiqiang Zhang.Building Structure,Vol.31,No.9,61-62(2001).
[5] Xingang Zhou, et al.Building Structure,Vol.32 , No.8,38-40(2002).
[6] Deyong Wang.Experimental Study on Inorganic Chemistry Planting-bar Technique.Xian university of science and technology(2007).
[7] Jianrong Zhang.et al.Journal of Building Structures,Vol.26, No.5,96-103(2005).
[8] Zhiqiang Zhang.Building Structure,Vol.31,No.9,61-62(2001).
Online since: August 2011
Authors: Yu Jun Gong, Song Shan Qiu, Ye Zhang, Jin Ping Wei
Centrifuged the samples with 3000 rpm at the time of 5min, the waste plastic saturated absorption oil was squeezed and damaged interior structure.
Fig.3 Surface structure of small Fig.4 Surface structure of big aperture the foam (M) aperture the foam (N) As shown in Fig.3 and Fig.4, foamed plastic surfaces were many sizes closed bubble hole.
They were independent of each other and appear mesh structure.
This related to big specific surface area and the strong van der Waals force or some chemistry binding force. (2) At the same of oil slick thickness (2mm), the oil-absorbing quality of the foam M was bigger than foam N, therefore small aperture foam had high selectivity.
Fig.6 Surface structure of small Fig.7 Surface structure of big aperture the foam (M) by press aperture the foam (N) by press Conclusions (1) The shockproof foam plastic (EPE) of waste plastics was cheaper to use oil-absorbing materials, the saturated oil-absorbing capacity could achieve to 30kg/kg.
Fig.3 Surface structure of small Fig.4 Surface structure of big aperture the foam (M) aperture the foam (N) As shown in Fig.3 and Fig.4, foamed plastic surfaces were many sizes closed bubble hole.
They were independent of each other and appear mesh structure.
This related to big specific surface area and the strong van der Waals force or some chemistry binding force. (2) At the same of oil slick thickness (2mm), the oil-absorbing quality of the foam M was bigger than foam N, therefore small aperture foam had high selectivity.
Fig.6 Surface structure of small Fig.7 Surface structure of big aperture the foam (M) by press aperture the foam (N) by press Conclusions (1) The shockproof foam plastic (EPE) of waste plastics was cheaper to use oil-absorbing materials, the saturated oil-absorbing capacity could achieve to 30kg/kg.
Online since: December 2011
Authors: Li Qing Fang, Hong Kai Wang, Kai Chen
Surface micro-machining technology is use light or other technology to make the surface of silicon lithography film deposition or growth, and it has some graphics, and then through selective etching to remove the sacrifice layer, to retain the structure of the remaining layers to form three-dimensional structure.
LIGA technology is considered the best high aspect ratio micromachining process, a width of several microns, the depth of up to 1000 microns, and can achieve mass production of micro devices.LIGA technology in the production of very thick micro-mechanical structure has its unique advantages, conventional microelectronic technology can not be replaced[4].
Other micro-structure processing technology.
In the MEMS system, all the geometric distortion is so small (molecular level), so that between the stress and strain within the structure of the linear relationship (Hooke's law) no longer exists.
MEMS electronic, machinery, materials, manufacturing, information and automatic control, physics, chemistry and biology and other disciplines.
LIGA technology is considered the best high aspect ratio micromachining process, a width of several microns, the depth of up to 1000 microns, and can achieve mass production of micro devices.LIGA technology in the production of very thick micro-mechanical structure has its unique advantages, conventional microelectronic technology can not be replaced[4].
Other micro-structure processing technology.
In the MEMS system, all the geometric distortion is so small (molecular level), so that between the stress and strain within the structure of the linear relationship (Hooke's law) no longer exists.
MEMS electronic, machinery, materials, manufacturing, information and automatic control, physics, chemistry and biology and other disciplines.
Online since: May 2016
Authors: Andrei Antipov, Oleg Khait, Oleg Medvedev, Alexander Usikov, Heikki Helava, Yuri Makarov, Sergey Kurin, Alexander D. Roenkov, Iosif Barash
A common feature of the power device structure is a several micron thick undoped GaN layer that is either the only active layer (SBD structure) or a sub-layer of a multi-layer (HEMT structure).
Details of the GaN layers and GaN/AlGaN structures growth and characterization can be found elsewhere [7].
Obviously the surface contamination forms additional channel for current leakage of GaN/SiC structures and an optimization of the laser scribing is needed.
Sapphire and SiC wafers demonstrate different mechanism of ultrafast laser-induced damage because of different electronic structure of the materials.
Lide, ed., CRC Handbook of Chemistry and Physics, Internet Version 2005,, CRC Press, Boca Raton, FL, 2005.
Details of the GaN layers and GaN/AlGaN structures growth and characterization can be found elsewhere [7].
Obviously the surface contamination forms additional channel for current leakage of GaN/SiC structures and an optimization of the laser scribing is needed.
Sapphire and SiC wafers demonstrate different mechanism of ultrafast laser-induced damage because of different electronic structure of the materials.
Lide, ed., CRC Handbook of Chemistry and Physics, Internet Version 2005,
Online since: April 2016
Authors: Wei Quan Shao, Yan Qiang Li, Ying Nan Zhang, Hai Feng Zhao, Li Zhu He, Jia Jia Feng, Sha Ou Chen, Xiao Jie Guo, Yue Qin Ban, Hai Ling Zhu
The crystal structures of the treated powders were analyzed by X-ray diffractometry (XD3).
The carbon was not detected because of its amorphous structure.
c b a Fig. 2 Images of the Si/C composite with electrostatic spinning (a), without electrostatic spinning (b), and Si/C composite with citric acid(c) Fig. 2a showed the electrostatic spinning of the Si/C composite sample with aggregated porous structure, the porous structure could accommodate the Si volume expansion [9, 10] in the process of charging and discharging process.
The results provided clear evidence that the carbon-coated [15, 8] Si nanoparticles with porous nanofiber structure can enhance Li storage properties.
Journal of Electroanalytical Chemistry 727(2014) 8–12
The carbon was not detected because of its amorphous structure.
c b a Fig. 2 Images of the Si/C composite with electrostatic spinning (a), without electrostatic spinning (b), and Si/C composite with citric acid(c) Fig. 2a showed the electrostatic spinning of the Si/C composite sample with aggregated porous structure, the porous structure could accommodate the Si volume expansion [9, 10] in the process of charging and discharging process.
The results provided clear evidence that the carbon-coated [15, 8] Si nanoparticles with porous nanofiber structure can enhance Li storage properties.
Journal of Electroanalytical Chemistry 727(2014) 8–12
Online since: March 2014
Authors: Nikolajs Toropovs, Linda Krage, Diana Bajare, Genadijs Sahmenko, Aleksandrs Korjakins
The Formation of Microstructure in High Strength Concrete Containing Micro and Nanosilica
Nikolajs Toropovs1,a, Diana Bajare1,b, Genadijs Sahmenko1,c*, Linda Krage2,d, Aleksandrs Korjakins1,e
Riga Technical University, Kalku str. 1, LV-1658, Riga, Latvia
1Faculty of Civil Engineering, Institute of Materials and Structures
2 Faculty of Material Science and Applied Chemistry, Institute of Silicate Materials
aNikolajs.Toropovs@rtu.lv, bDiana.Bajare@rtu.lv, cGenadijs.Sahmenko@rtu.lv, dLinda.Krage@rtu.lv, eAleksandrs.Korjakins@rtu.lv
Keywords: Microsilica, nanosilica, high strength concrete, microstructure, mechanical properties
Abstract.
At the same time, it would be useful to find out whether high concentrations of micro- and nanosilca admixtures have positive effect on high performance concrete structure formation processes and justify the use of resources.
As seen on Fig. 1, in certain areas of the concrete structure nanosilica and microsilica particles have retained their initial round shape (marked with an arrow) despite the fact that the cement hydration process in the respective areas has terminated and a relatively compact C-S-H structure was formed.
SEM analysis for the 6-month old concrete samples shows compact structure, similarly with a 28 day's old concrete.
Monteiro, Hight performance concrete; from material to structure.
At the same time, it would be useful to find out whether high concentrations of micro- and nanosilca admixtures have positive effect on high performance concrete structure formation processes and justify the use of resources.
As seen on Fig. 1, in certain areas of the concrete structure nanosilica and microsilica particles have retained their initial round shape (marked with an arrow) despite the fact that the cement hydration process in the respective areas has terminated and a relatively compact C-S-H structure was formed.
SEM analysis for the 6-month old concrete samples shows compact structure, similarly with a 28 day's old concrete.
Monteiro, Hight performance concrete; from material to structure.
Online since: March 2011
Authors: Yan Li He
Everything can be transformed into a complex network because everything is manifestation of interaction, such as the basic interaction between objects in physics, the interaction among molecules in chemistry, the interaction between data point in classification.
Therefore, the structure of an object considered as system can be given an abstract of a network.
Such features include a heavy tail in the degree distribution, a high clustering coefficient, assortativity or disassortativity among vertices, community structure, and hierarchical structure.
For example, world-wide network, pages or links may be disconnected at any time, resulting in network structure is changing.
Newman, The structure and function of complex networks, SIAM Review 45, 2003, pp.167-256
Therefore, the structure of an object considered as system can be given an abstract of a network.
Such features include a heavy tail in the degree distribution, a high clustering coefficient, assortativity or disassortativity among vertices, community structure, and hierarchical structure.
For example, world-wide network, pages or links may be disconnected at any time, resulting in network structure is changing.
Newman, The structure and function of complex networks, SIAM Review 45, 2003, pp.167-256
Online since: December 2011
Authors: Hui Xing Huang, Hai Chao Li, Shao Bin Huang, Shui Xia Chen
that is, a hollow structure.
For the hollow structure in H-PtRu/ACF, the shell consisted of nonaparticles with a diameter of about 5 nm.
As for the hollow structure in H-PtRu/CNTs, the average diameter of the nanoparticles which constructed the shell was 3 nm.
This peak in H-PtRu/ACF was broad and its diffraction density was low, which confirmed the disordered micro-graphitic structure of ACF.
It has been observed that surface Pt enrichment is also possible [10] and surface structures and interaction affect the bimetallic PtRu catalyst activity [11].
For the hollow structure in H-PtRu/ACF, the shell consisted of nonaparticles with a diameter of about 5 nm.
As for the hollow structure in H-PtRu/CNTs, the average diameter of the nanoparticles which constructed the shell was 3 nm.
This peak in H-PtRu/ACF was broad and its diffraction density was low, which confirmed the disordered micro-graphitic structure of ACF.
It has been observed that surface Pt enrichment is also possible [10] and surface structures and interaction affect the bimetallic PtRu catalyst activity [11].