Search results

The crystal structure of hafnium tungstate displays unusual property of isotropic negative thermal expansion in a wide temperature range which brings about a number of important potential applications.
It is the compressive stress that account for the orthorhombic structure of HfW2O8.
The structure of α-HfW2O8 is a framework of corner-sharing HfO6 octahedra and WO4 tetrahedra.
An isostructural order-disorder transition to another cubic Pa3 structure at about 468K due to the disordering of the WO4 tetrahedra.
Argyrious, S.Short, and A.W.Sleight, J.solide state Chemistry.

Transmission electron microscope(TEM) characterization indicated that the particles were form uniform analogous core-shell structure and dynamic light scattering(DLS) analysis possessed narrow size distributions.
The self-stratifying polyacrylate latex containing silicon analogous core-shell structure were characterized by dynamic light scattering(DLS) analysis, transmission electron microscopy(TEM) and X-ray photoelectron spectroscopy(XPS).
From the images, we can see that the latex particles have analogous core-shell structure obviously.
TEM micrographs revealed that the latex particles have analogous core-shell structure obviously.
Funke, Preparation and properties of paint films with special morphological structure, J.

The microstructure, element composition, crystal structure, phases and dynamic electromagnetic parameters of the products were analyzed by SEM, EDS, XRD and the microwave vector network analyzer.
Ferrites, as a typical kind of microwave absorbing material, are classified into Spinel type, Magnetoplumbite type and Garnet type by the crystal structure.
Microwave absorbing capabilities of ferrites are related not only to the chemical composition, the structure and the dimension, but also to the preparative technique and the thermal treatment condition.
The microstructure, element composition, crystal structure, phases and electromagnetic parameters of each product were analyzed by SEM, EDS, XRD and the microwave vector network analyzer.
Kershi: Materials Chemistry and Physics, Vol. 113 (2009), p.196 [5] B.S.

In order to improve the neural network structure and setting method of parameters, based on the glowworm swarm optimization (GSO) and BP neural network (BPNN), an algorithm of BP neural network optimized glowworm swarm optimization (GSOBPNN) is proposed.
Such as climate change will cause chaos, chaotic phenomena exist in mathematics, physics, chemistry, biology, chaotic appearance, chaos theory.
Each individual contains all the BPNN weights and thresholds, and each individual can represent a BPNN structure.
chaotic time series prediction of tent mapping In the experiment, the structure of BP neural network chooses the m-5-1 typical three layer structure; the integration time step of the tent mapping is 0.1, the embedding dimension is 2, the delay time is 1.

Their structures were identified as: linoleic acid(1), dibutyl-phthalate(2), p-hydroxy benzaldehyde (3), hydroxyacetophenone (4), isoscoparin (5), 5,7,3',4'-tetrahydroxyflavone-6-b-D-glucopyranoside(6).
Every compound obtained was subjected to detail spectroscopic analysis to establish their chemical structures.
The structures of these known compounds were identified by direct comparison of their spectral data (1H-NMR and 13C-NMR and DEPT) with those reported values in the corresponding literatures.
The structures of compounds are shown in Fig 1.
Chinese Journal of Medicinal Chemistry.Vol 20 (2010), p. 527 [13] Y.

The structure of the electrospun fibers were studied with the aid of scanning electron microscopy, transmission electron microscopy, and X-ray photoelectron spectroscopy.
The morphology and structure of the electrospun mats were examined and discussed.
Furthermore, TEM observation was applied to confirm the structure and the image was shown in Fig. 3.
The results of XPS and TEM confirmed the structure of nanofibers containing AgNPs.
Chirachanchai, Materials Chemistry and Physics, Vol. 115 (2009), p. 296

For nanoscale devices and structures, interface phenomena often dominate their overall thermal behavior.
This is especially true for nanoscale devices and structures, where interface phenomena often dominate their overall thermal behavior [1].
Conclusions and discussions With the scales of the structures in advanced materials and devices go to nano- and atomic scales, the interface plays an increasingly important role in the products’ behaviors.
Goddard: Journal of Physical Chemistry A Vol. 107 (2003), p. 3803 [9] Q.
Xiao: Journal of Molecular Structure: THEOCHEM Vol. 851 (2008), p. 242 [18] T.

The article considers the method of stabilizing roadbed soils by introducing metallurgical waste in the structure of the composite binder.
Research of compositions Composition # The structure of the binding component, % Density of samplesr, [kg/m3] Portland cement Crushed blast furnace slag 1 100 0 2.139 2 70 30 2.144 3 50 50 2.176 4 30 70 2.110 The analysis of Fig. 2 showeda positive efficiency of introducingcrushed blast furnace slagto the composition of soil cement.
Such soils are characterized by the recovery of their structure after mechanical damage.
Mokeev, Hydration of Portland cement in the presence of aluminium-containing setting accelerators, Journal of applied chemistry. 86(6) (2013) 849-857
Komarichev, Composite materials on the basis of cement and water activated systems for injection compacting of concrete in enclosing structures, Construction materials. 5 (2015) 31-35

Effective and Ecological Technologies of Application of Structured Materials for Roadbed in the Permafrost Regions V.G.
The work is devoted to effective and ecological technologies for the application of functional structured materials for roads, railways, airfields on permafrost with forced cooling of the sub-soil foundation.
Modeling of the structure of a roadbed with a two-layer coating was carried out based on the solution of the nonlinear boundary problem for convective and thermoradiation heat exchange [10, 14, 18, 19].
However, for the construction of engineering structures, it is often necessary to ensure conditions for accelerated soil freezing in order to accumulate a certain “cold reserve“ for the summer period.
Sidorov, Statement of the problem of calculating thermo-visco-elastic stresses in semitransparent polymeric materials under conditions of combined heating, Physis and Chemistry of polymers 5 (1999) 97-101

Ph. 86-10-62332472 Fax 86-10-62332472 a suxintai827@163.com, b yqz_2007@sina.com.cn, cgehome@mater.ustb.edu.cn Keywords: Auto-ignition, Ba3(Ca1.18Nb1.82)O9-δ(BCN18), high temperature proton conductors, complex perovskite Abstract: Ba3(Ca1.18Nb1.82)O9-δ (BCN18) is a novel complex perovskite structure proton conductor.
In order to solve these problems, several solution chemistry routes such as sol-gel method [8-9] have been studied.