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Online since: April 2013
Authors: Cristina Carvalho, Fernando Noronha, Silvia Aires, Antonio Casal Moura, Joao Farinha Ramos
This work is a contribution to improve the knowledge about mineralogy, fabric, chemistry and technology of the “schist”, in order to promote its exploitation and use as a natural stone.
The geological structure, the intensity of deformation, the degree of metamorphism and the state of fracturing of the rock mass are important to determine exploitability and profitability of an exploitation of this material.
The GTMZ and CIZ were structured by a succession of three phases of Variscan deformation: D1, D2 and D3 [5, 6].
The geological and structural mapping of the selected sites was realized with identification of major ductile and brittle structures with possible influence on the mechanical behaviour of “schist” that can restrict its use as a natural stone.
A study in Tanha region showed a similar structure to the one identified in the work carried at Poio [16], which suggests an important axis ENE-WSW where the regional structure is favourable to the exploitation of natural stone in new sites.
The geological structure, the intensity of deformation, the degree of metamorphism and the state of fracturing of the rock mass are important to determine exploitability and profitability of an exploitation of this material.
The GTMZ and CIZ were structured by a succession of three phases of Variscan deformation: D1, D2 and D3 [5, 6].
The geological and structural mapping of the selected sites was realized with identification of major ductile and brittle structures with possible influence on the mechanical behaviour of “schist” that can restrict its use as a natural stone.
A study in Tanha region showed a similar structure to the one identified in the work carried at Poio [16], which suggests an important axis ENE-WSW where the regional structure is favourable to the exploitation of natural stone in new sites.
Online since: October 2010
Authors: Zhou Cheng Wang, Peng Sun, Fang Ping Zhu, Ruo Xuan Huang, Zheng Bing Qi
Effect of Substrate Temperature on Structure and Mechanical Properties of ZrN Coatings
Zhengbing Qi1,a, Ruoxuan Huang1,b, Fangping Zhu1,c, Peng Sun1,d,
Zhoucheng Wang1,e*
1 College of Chemistry and Chemical Engineering, Xiamen University, Xiamen, China
azbqi_xmu@126.com, bhrx0330@yahoo.com.cn, czfp0307@yahoo.com.cn, dsunpeng312@hotmail.com, e*zcwang@xmu.edu.cn
Keywords: ZrN; coating; substrate temperature; orientation; mechanical properties.
From 50 to 450, the coatings showed columnar structure, and at 600 the columnar disappeared, presenting equiaxed structure instead.
The crystal structure of ZrN coatings were investigated by X-ray diffraction XRD (Philips, Netherlands).
It is revealed that all the coatings have a NaCl structure and both (200) and (111) peaks coexist.
However, when Ts reaches 600, the columnar structure disappeared, replaced by an equiaxed structure, with a decreasing of the grain size.
From 50 to 450, the coatings showed columnar structure, and at 600 the columnar disappeared, presenting equiaxed structure instead.
The crystal structure of ZrN coatings were investigated by X-ray diffraction XRD (Philips, Netherlands).
It is revealed that all the coatings have a NaCl structure and both (200) and (111) peaks coexist.
However, when Ts reaches 600, the columnar structure disappeared, replaced by an equiaxed structure, with a decreasing of the grain size.
Online since: February 2016
Authors: G.P. Vyatkin, Sergey Anatolevich Sozykin, Valeriy Petrovich Beskachko
The structure of defective tubes in ground state is considered, the role of effects related to finite sizes of a model is evaluated.
Zhang, First-principles study of interaction of molecular hydrogen with Li-doped carbon nanotube peapod structures, Physical Review B. 77 (2008) 033405
Beskachko, Structure of endohedral complexes of carbon nanotubes encapsulated with lithium and sodium, Molecular Physics. 111 (2013) 930-938
Broto, Ab Initio Study of the Electronic and Vibrational Properties of 1-nm-Diameter Single-Walled Nanotubes, Advances in Materials Physics and Chemistry. 3 (2013) 178-184
Wu, First-Principles Study of Lithium Adsorption and Diffusion on Graphene with Point Defects, The Journal of Physical Chemistry C. 116 (2012) 21780-21787
Zhang, First-principles study of interaction of molecular hydrogen with Li-doped carbon nanotube peapod structures, Physical Review B. 77 (2008) 033405
Beskachko, Structure of endohedral complexes of carbon nanotubes encapsulated with lithium and sodium, Molecular Physics. 111 (2013) 930-938
Broto, Ab Initio Study of the Electronic and Vibrational Properties of 1-nm-Diameter Single-Walled Nanotubes, Advances in Materials Physics and Chemistry. 3 (2013) 178-184
Wu, First-Principles Study of Lithium Adsorption and Diffusion on Graphene with Point Defects, The Journal of Physical Chemistry C. 116 (2012) 21780-21787
Online since: May 2010
Authors: Cai Bei Zhang, Lin Zhang, Qin Na Fan, Shao Qing Wang
Molecular Dynamics Investigation of Relaxation and Local Structure
Changes in a Quenched Molten TiAl Alloy Film
Lin Zhang1,* Qin-na Fan1 Cai-bei Zhang1 Shao-qing Wang2
1
Institute of Materials Physics and Chemistry, College of Science, Northeastern University,
Shenyang 110004, China
2
Shenyang National Laboratory for Materials Science, Institute of Metal Research,
Chinese Academy of Sciences, Shenyang 110016, China
*Correspondence: Lin Zhang, Northeastern University P.O.Box 104, Shenyang, 110004, China,
Telephone: 024-83678479, e-mail: zhanglin@imp.neu.edu.cn
Keywords: film, molecular dynamics, computer simulation, phase transition
Abstract.
These give us a suggestion that the film structures have FCC structural features as well as a few of HCP local structures.
As the quenching temperature is decreased, these ordered local structures can stably exist.
Most atoms in this film can form FCC local structures as well as some HCP local structures.
At a lower quenched temperature, after some local icosahedral(Ih) structures are nucleated, there exist transformation from Ih structures to FCC and HCP structures.
These give us a suggestion that the film structures have FCC structural features as well as a few of HCP local structures.
As the quenching temperature is decreased, these ordered local structures can stably exist.
Most atoms in this film can form FCC local structures as well as some HCP local structures.
At a lower quenched temperature, after some local icosahedral(Ih) structures are nucleated, there exist transformation from Ih structures to FCC and HCP structures.
Online since: October 2025
Authors: Santosh Nandi, S.S. Kerur, Praveen Barmavatu, Akshata Dudhani, Sateesh Hosmane, Abdullah Yahya Abdullah Alzahrani
Sheshgiri Campus, Udyambag, Belagavi, 590008, Karnataka, India
5Department of Chemistry, KLE Technological University, Dr.
MOFs are promising pathways to the development of advanced functional materials, due to their well-defined host–guest chemistry, long-range order, and flexibility in synthesis [6].
These diffractions reflect the successful formation of the crystalline structure of the Co-MOF.
Franziska, Increasing Exposed Metal Site Accessibility in a Co-MOF-74 Material with Induced Structure-Defects.
Ahmed, Fe/Co-MOF Nanocatalysts: Greener Chemistry Approach for the Removal of Toxic Metals and Catalytic Applications.
MOFs are promising pathways to the development of advanced functional materials, due to their well-defined host–guest chemistry, long-range order, and flexibility in synthesis [6].
These diffractions reflect the successful formation of the crystalline structure of the Co-MOF.
Franziska, Increasing Exposed Metal Site Accessibility in a Co-MOF-74 Material with Induced Structure-Defects.
Ahmed, Fe/Co-MOF Nanocatalysts: Greener Chemistry Approach for the Removal of Toxic Metals and Catalytic Applications.
Online since: August 2013
Authors: Juan Xu, Hai Yan Bie, Zhong Hai Zhou, Zong Rui Hao
Numerical simulation of the effects of baffle on flow field in a stirred tank
Zongrui Hao1, a, Juan Xu1, b, Haiyan Bie2, c Zhonghai Zhou1
1 Institute of Oceanographic Instrument of Shandong Academy of Science, Qingdao, 266001, China
2 College of Chemistry and Chemical Engineering of Ocean University of China, Qingdao, 266100, China
ahaozr001@sina.com, bxujuan101066@163.com, csalany001@163.com
Keywords: Numerical simulation, Stirred tank, Flow field, Baffle
Abstract.
Flow characteristics of stirred tanks with different structures were calculated by taking RNG k-ε model as the turbulent flow model.
With the numerical simulation method, the flow fields in stirred tank with different structures were studied to get the detailed flow field information.
It can be seen that, with the speed higher, the vortices near the blade increased to form vortex structures of different strength, which gradually wrapped the entire blades.
(a) Vm=30 s-1 (b) Vm=50 s-1 (c) Vm=100 s-1 (d) Vm=150 s-1 Fig.3 Vorticity distribution in the stirred tank without baffle at 10 rad/s (a) Vm=30 s-1 (b) Vm=50 s-1 (c) Vm=100 s-1 (d) Vm=150 s-1 Fig.4 Vorticity distribution in the stirred tank without baffle at 15 rad/s (a) Vm=30 s-1 (b) Vm=50 s-1 (c) Vm=100 s-1 (d) Vm=150 s-1 Fig.5 Vorticity distribution in the stirred tank with baffle at 10 rad/s (a) Vm=30 s-1 (b) Vm=50 s-1 (c) Vm=100 s-1 (d) Vm=150 s-1 Fig.6 Vorticity distribution in the stirred tank with baffle at 15 rad/s The comparative analyses of the vector field of the axial section in the stirred tanks with different structures were showed in Fig.7.
Flow characteristics of stirred tanks with different structures were calculated by taking RNG k-ε model as the turbulent flow model.
With the numerical simulation method, the flow fields in stirred tank with different structures were studied to get the detailed flow field information.
It can be seen that, with the speed higher, the vortices near the blade increased to form vortex structures of different strength, which gradually wrapped the entire blades.
(a) Vm=30 s-1 (b) Vm=50 s-1 (c) Vm=100 s-1 (d) Vm=150 s-1 Fig.3 Vorticity distribution in the stirred tank without baffle at 10 rad/s (a) Vm=30 s-1 (b) Vm=50 s-1 (c) Vm=100 s-1 (d) Vm=150 s-1 Fig.4 Vorticity distribution in the stirred tank without baffle at 15 rad/s (a) Vm=30 s-1 (b) Vm=50 s-1 (c) Vm=100 s-1 (d) Vm=150 s-1 Fig.5 Vorticity distribution in the stirred tank with baffle at 10 rad/s (a) Vm=30 s-1 (b) Vm=50 s-1 (c) Vm=100 s-1 (d) Vm=150 s-1 Fig.6 Vorticity distribution in the stirred tank with baffle at 15 rad/s The comparative analyses of the vector field of the axial section in the stirred tanks with different structures were showed in Fig.7.
Online since: November 2006
Authors: Zhi Qiang Jiang, Xi Lan Feng, Jin Fa Shi
The
chemistry composition and nodularity of sample is shown in table 1 and the sketch of tensile sample is
shown in figure 1 (Diameter is 8 mm).
Table.1 The chemistry composition and nodularity of sample No.
So, it is very important reference for the design and select material of mechanical structure and configuration.
So, only under �<�s, the plastic rupture is not happened, and the engineering structure can working normally.
The critical damage variable can forecast the residual lifecycle of mechanical structure and prevent the paroxysmal accident.
Table.1 The chemistry composition and nodularity of sample No.
So, it is very important reference for the design and select material of mechanical structure and configuration.
So, only under �<�s, the plastic rupture is not happened, and the engineering structure can working normally.
The critical damage variable can forecast the residual lifecycle of mechanical structure and prevent the paroxysmal accident.
Online since: April 2013
Authors: M. Avdeev, L. A. Awin, Brendan J. Kennedy
Both series have an orthorhombic perovskite-type structure in space group Pbnm.
The structures were refined using the program RIETICA [12].
The structures were refined from the synchrotron X-ray diffraction data.
A representation of the LaRh0.5Cu0.25Zn0.25 O3 structure is included.
Ivanovskii, Journal of Structural Chemistry, 49 (2008) 781-787
The structures were refined using the program RIETICA [12].
The structures were refined from the synchrotron X-ray diffraction data.
A representation of the LaRh0.5Cu0.25Zn0.25 O3 structure is included.
Ivanovskii, Journal of Structural Chemistry, 49 (2008) 781-787
Online since: July 2019
Authors: Rolen Brian P. Rivera, Ma. Reina Suzette B. Madamba, Melchor J. Potestas, Blessie A. Basilia, Rey Capangpangan, Arnold C. Alguno, Bernabe L. Linog
Antibacterial Activities of Zinc Oxide Nanostructures with Different Structures
Rolen Brian P.
We report on antibacterial activities of Zinc oxide (ZnO) with different structures.
Nanorods exhibit a better antibacterial response than the sea-urchin like structure.
Clearly, from these results, two types of structures of ZnO - nanorods and sea urchin-like nanotructures.
This means that the nanorods have more ZnO purity than the sea urchin-like structures.
We report on antibacterial activities of Zinc oxide (ZnO) with different structures.
Nanorods exhibit a better antibacterial response than the sea-urchin like structure.
Clearly, from these results, two types of structures of ZnO - nanorods and sea urchin-like nanotructures.
This means that the nanorods have more ZnO purity than the sea urchin-like structures.
Online since: October 2016
Authors: Petri Vuoristo, Heli Koivuluoto, Liene Pluduma, K. Gross, Edijs Freimanis, Kent Algate, David Haynes
The aim of this work was to both orient the crystals as well as fill the structure with hydroxyl ions for further increasing the surface electrical potential.
Cell behaviour depends on the surface chemistry, topography and energy.
FTIR results showed that coatings subjected to water vapour contain more OH- ions in the structure compared to the conventional coatings (Fig 3-a).
Kelvin probe AFM measurements showed that hydroxyapatite coating with more OH- ions in the structure possessed a higher surface electric potential (Fig 3-b).
Surface electric potential increases with a higher amount of OH- ions in the HA structure.
Cell behaviour depends on the surface chemistry, topography and energy.
FTIR results showed that coatings subjected to water vapour contain more OH- ions in the structure compared to the conventional coatings (Fig 3-a).
Kelvin probe AFM measurements showed that hydroxyapatite coating with more OH- ions in the structure possessed a higher surface electric potential (Fig 3-b).
Surface electric potential increases with a higher amount of OH- ions in the HA structure.