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Online since: April 2015
Authors: Ámos Dufka, Tomáš Melichar
The aim was to develop such a mix that can be used for building real structures using the sprayed concrete technology exploited in the conditions of an increased fire risk.
Sprayed concrete from a leading building chemistry manufacturer was chosen for this purpose.
CZ.1.05/2.1.00/03.0097, with the activities of regional centre AdMaS “Advanced Materials, Structures and Technologies.”
Association for rehabilitation of concrete structures, Brno 2013, ISBN 978-80-260-2210-7, 262 pages.
Online since: November 2011
Authors: Shao Huan Guo, Hui Zhang, Ting Fan
Roach et al. [13] examined the protein-surface interactions between protein and silica spheres (15-165 nm) using infrared spectroscopy and found both surface chemistry and topography playing key roles in determining the structure of the bound proteins.
Results and Discussion The effect of pH on structure and morphology of BSA-LDO nanohybrids.
After modifying with BSA in varied pH solutions, the BSA-LDO-p7.4 (Fig. 1a) shows a slightly reduced crystallinity indicated by slightly reduced intensities of (200) and (220) diffractions, while BSA-LDO-p8.2 (Fig. 1b) depicts an approximately amorphous structure with almost disappeared (200) and (220) lines, indicating that the crystal structure of BSA-LDO can be better remained in neutral medium.
The XRD patterns (Fig. 6e,f) show approximately amorphous structures after adsorption of Lys.
The pH effect on the structure and morphology has been carefully studied by systemically characterized via XRD, FT-IR, SEM and UV-vis methods.
Online since: November 2013
Authors: Moe Thazin Shwe, Marites M. Dimaculangan, Mark Daniel G. De Luna
RB 19 is very resistant to chemical oxidation due to its aromatic anthraquinone structure highly stabilized by resonance.
Reactive Blue RB 19, also known as Remazol brilliant blue, is very resistant to chemical oxidation due to its aromatic anthraquinone structure highly stabilized by resonance.
Oturan ., Electro-Fenton process and related electrochemical technologies based on Fenton’s reaction chemistry."
Online since: August 2018
Authors: Minch Quang Do, Hoc Thang Nguyen, Van Quang Le, Minh Duc Hoang, Vo Thi Ha Quyen Pham, Thu Ha Bui
Geopolymer is an inorganic polymer material formed from alumino-silicate structures.
This is the main geopolymeric structures known as amorphous phases.
Davidovits, Geopolymer chemistry and application, 3rd editon, Institute Geopolymer, France, 2011
Online since: June 2010
Authors: Xin Zhao, Ying Rong Jin, Xing Hua Zhu
XRD analysis indicated the structure of PbI2 crystal is 2H with hexagonal space group of mlP3 , the lattice constants of a and c are 0.4560 nm and 0.6979 nm, respectively.
Firstly, PbI2 starting materials are usually synthesized by chemistry method or directly provided by commercial corporations, which contain a lot of impurities [9].
X-ray studies on powders have confirmed the crystal structure of PbI2 is 2H with hexagonal space group of mlP3 .
Online since: January 2012
Authors: Ding Feng, Xiao Fei Chang, Xian Yong Zhang, Shou Yong Li, Chao Ruan, Yu Xie
This paper discusses the requirements for the design of the hydrocyclone desander equipment with compact structure, applicable to offshore drilling platforms,and carrying out CFD simulation, the results showing that the particle size of 75 of sand, grit removal efficiency above 90%. 1.
Separation Performance of separation many factors, including fluid in the particle size, density and concentration, run-time capacity and inlet pressure and the separator structure.
[5] WU Chundu~1; Zhang Wei~2; Huang Yongqiang~1; Zhang Bo~1(1.School of Bio and environmental; Jiangsu University; Zhenjiang 212013; China; 2.School of Mechanical Engineering; China); Transactions of the Chinese Society of Agricultural Engineering,[J], 2006,22(2): 98-102 [6] PENG Jiong~(1; 2) Wang Xiaojin~2 Zou Lei~2 Li Guanghe~1 Zhang Xu~1 Chen Jinnan~2 (1.Department of Environmental Science and Engineering; Tsinghua University; Beijing; 100084; China; 2.School of Chemical Engineering and the Environment Science; Beijing Institute of Technology; 100081; China); Numerical simulation of three-dimensional two-phase flow in hydrocyclone[J], Computers and Applied Chemistry, 2006,23(8): 728-732
Online since: August 2020
Authors: Fedor L. Kapustin, Andrey Vishnevsky
To optimize the structure and properties it is proposed to introduce an additive of natural gypsum in the amount of 3-5 % of the mass of dry components into the autoclave aerated concrete.
The produced aerated ash concrete had a thermal conductivity of 0.075-0.100 W/m∙K which allows it to be used for erection of single-layer enclosing structures without additional insulation.
Analysis of the obtained AAAC samples showed that concrete with density 300 and 400 kg/m3 has a homogeneous structure free of visible damage (Fig. 1).
Compliance with the optimal prescription-technological parameters of production of concrete structures with FA use provides F200-F300 frost resistance to concrete.
Congress on cement chemistry, Stroyizdat, Moscow, 1997, pp. 104-106
Online since: August 2017
Authors: B. Rekha, S. Seenithurai, R. Kodi Pandyan, S. Vinodh Kumar, Mahendran Manickam
Octagraphene is a versatile structure with periodic sp2 – bonded carbon atomic planar sheet.
This σ bond is responsible for the robustness of the lattice structures in the carbon allotropes.
Defective structure comprises of octagons and rectangular lattices of different bond lengths.
Fig 1 illustrates the structure of octagraphene with two bond lengths 2.17 and 1.37Å.
Lavernia, The Journal of Physical Chemistry C 113 (2009) 5
Online since: March 2016
Authors: Wei Li, Jing Tan, Jian Quan Guo, Wei Na Wu, Qian Shi, Chun Liang Li
The prepared CdSe cores showed zinc-blende structure with size exceeded over 7 nm.
Morphologies and structures of the quantum dots were characterized by HR-TEM and XRD diffraction.
As discussed later in the XRD result, the CdSe QDs prepared here show zinc-blende structure.
It was know that zinc-blende structured CdSe QDs had superior optical properties than wurtize crystalline QDs [14,19].
XRD showed that the prepared QDs before and after shell coating were zinc-blende structure.
Online since: October 2006
Authors: Stephen Skinner
Diffusion and Defects in Oxides with the K2NiF4 Structure Type Stephen J.
The majority of these previous studies have concentrated on either the fluorite (electrolyte) [1,2] or perovskite (electrode) [3-5] structured oxides.
In this case the structural chemistry is of considerable importance and as a consequence there are relatively few systems that could support interstitial conduction.
One such system is the K2NiF4 structured oxides that consist of layers of perovskite (ABO3) separated by layers of rock salt (AO), Fig. 1.
In this structure there is sufficient flexibility within the structure to accommodate interstitial ions in the AO layers.