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Online since: May 2011
Authors: Jun Lu
In the general case, there are always many diatomic structures in the one-dimensional nanomaterial.
Diatomic systems are considerably more complex in structure than monatomic systems, and correspondingly less has been accomplished in the quantitative application of quantum mechanics to diatomic problems.
The atoms are expected to have a stable equilibrium arrangement somewhere between a collapsed structure (which is unstable, since the atoms are repellent each other at short distances) and a dispersed structure (which is not the most stable structure if the diatomic system exists).
It is clear that a distinct problem arises in connection with diatomic structure, i.e. how we can obtain the solution of the diatomic system motion equation.
At present the Morse potential is still one of potential functions used mostly in atomic and molecular physics and quantum chemistry.
Online since: July 2011
Authors: Jun Long Zhou, Chun Xia Xu, Shi Yong Jiang, Bing Hong Li, Zhong Wen Ou
SiO2 in continuous basalt fiber are mainly active SiO2, and that active SiO2 tends to react with Ca(OH)2 to form calcium silicate hydrate, then the structure of basalt fiber has been destroyed and doesn’t have its original structure and properties.
Neighbour tetrahedrons are connected with each other in a way of sharing the same top in a chain-shape frame structure, tetrahedron and octahedron are connected by the same edge, and octahedrons are also connected in a way of sharing the same top.
Ca2+,K+,Na+ and other metallic cations are located in the gap produced in polyhedron cumulation to balance electro-valence and stabilize structure.
Tensile strength of BFRP bars goes down faster in alkaline environment at high temperature, corrosion is more serious, therefore, BFRP bars are not suitable to be used in concrete structures at high temperature.
Thesis of Master Degree, Logistical Engineering University, Mar.2009:1-2 [2]American Concrete Institute440.State-of-the-Art Report on Fiber Reinforced Plastic(FRP) Reinforcement for Concrete Structures(ACI440R-96).Michigan: Farmingtons Hills ,1996,1-25
Online since: April 2016
Authors: Jan Pospisil, Oldrich Zmeskal, Pavel Florian
Principle of the method The measurement is performed on samples with a three-electrode configuration similar to the structure of a field effect transistor.
Similarly, if RSD << RGS (the current flows dominantly through the gap structure – between S and D electrodes), then .
The chemical structures are shown in Fig. 3.
Fig. 3: Chemical structure of PCBM (on the left) and DPP(TBFu)2 (in the middle).
AC and DC Characterization of Gap and Sandwich Structures Based on ZnPc/PCBM Composite.
Online since: September 2008
Authors: Shinichi Tobishima, Tsuyoshi Takahashi, Kensaku Hayashi, Hideyuki Morimoto, Kazuhiko Takeno
X-ray diffraction measurements were carried out to examine crystalline structure.
It was suggesting that the sample should maintain the amorphous structures and -Fe2O3 was formed by thermal decomposition of -FeOOH exist in the sample at 350 ºC in air (formula: 2-FeOOH → -Fe2O3 + H2O).
First discharge potential of both composite electrodes gradually decreased without any step with an increase in time, suggesting that the electrode materials had amorphous structures.
The crystalline structure of -FeOOH exist in the composite material before heat treatment may be unstable to the electrochemical lithium insertion-extraction during a few cycles because it was conformed by x-ray diffraction Fig.4 Cycle performance of the various composite electrodes during cycling. 0 50 100 150 200 250 0 1.0 2.0 3.0 4.0 5.0 Potential / V vs.
Amorphous structure of FeOOH and crystalline structure of -Fe2O3 produced by heat treatment must be based on the high stability for electrochemical lithium insertion-extraction.
Online since: June 2014
Authors: Jin Ping Li, Ting Xu Yu, Gang Sun, Da Zhen Tang
Further research found that the three coal lithotypes are featured by remarkably different pore structure characteristics and maceral contents of coal are linearly correlated to some of pore structure parameters.
Pore structure research also mainly focused on middle-high rank coals [8-10].
Table 4 Pore structure properties of varying coal lithotypes Coal lithotype Sample No.
In contrast, the pores and structures in inertinite are less abundant.
Pure and Applied Chemistry, 1989, 61:1845-1852
Online since: January 2026
Authors: Taiki Morishige, Kaito Uruchida, Naoki Kadota
Neutralization of Impurity Elements of Cu and Ni in Mg-Zn Alloy by Dissolution into MgZn2 Phase Kaito URUCHIDA1,a*, Naoki KADOTA2,b and Taiki MORISHIGE3,c 1,2Graduate School of Science and Engineering, Kansai University, Osaka, Japan. 3Department of Chemistry and Engineering, Kansai University, Osaka, Japan.
When the concentrations of Cu and Ni exceeded this range, the crystal structure of the MgZn2 phase transformed from hexagonal (hP12) to cubic (cF24).
From Fig. 1, the main peaks of all samples can be indexed based on a hexagonal MgZn2 type structure (hP12), confirming the formation of MgZn2 phase.
From Fig. 4, the peaks of sample X = 6 can be indexed based on a cubic MgCu2 type structure (cF24), and a change in the crystal structure was observed.
However, when this concentration range was exceeded, the crystal structure of the MgZn2 phase transformed from hexagonal (hP12) to cubic (cF24).
Online since: October 2018
Authors: E.G. Gazenaur, L.V. Kuzmina, A.P. Rodzevich, E.V. Sugatov, V.I. Krasheninin
The paper is focused on the effect of homogenous and inhomogeneous magnetic fields on crystallization, and some physical and chemical properties of silver azide (morphology, electric resistance, defect structure, reactivity) as well.
It was found out that the increasing intensity in homogenous magnetic field causes formation of finer crystal structures, which are distributed more uniformly and systematically in the field of microscope in the sample cell.
Silver azide whiskers are selected as the object of research because they are model objects of chemistry of solids and initiating explosives.
This orientation is probably more ordered and structured in the homogenous magnetic field.
As for the defect structure of silver azide crystals, it is pointed at the complexity of the magnetic field effect on impurities in crystals.
Online since: October 2024
Authors: Hascholu Oimod, Bing Qin Zhou, Altan Bolag, Jun Ning, Hexig Alata, Ya Li Zhu, Xu Chao Song, Nan Ye Pan, Chen Hua Huang, Ojild Tegus
The phase structures of samples were investigated by using X-ray spectrum and steady-state fluorescence spectrometer.
We systematically investigated the effect of different sintering temperatures on the crystal structure and optical properties of Cs3Cu2I5 powder.
The crystal structures of the Cs3Cu2I5 powder phosphors were determined by powder X-ray diffractometer (Panalytical).
The samples can form an orthogonal structure of Cs3Cu2I5 phase at a sintering temperature of 100-400℃, and the space group is pnma.
Hosono, Lead-free highly efficient blue-emitting Cs3Cu2I5 with 0D electronic structure.
Online since: September 2013
Authors: Sara Porello
As it was immediately clear that mostly concerns ancient shipwrecks' structures which came from underwater environment and made of waterlogged wood, the analysis has therefore focused on waterlogged wood conservation and reinforcement.
Introduction The study deals with the complex issue of conservation and museums displaying of a particular kind of timber structures as those belonging to the naval heritage.
It was immediately clear that mostly concerns ancient shipwrecks' structures which came from underwater environment, showing special conservative needs, as made ​​of waterlogged wood.
Before the selection of the conservation method, the nature of deterioration must be characterised analyzing changes in terms of moisture content and cell walls chemistry that allow to determine the decay by comparison with modern wood.
Excavation of the Mary Rose had continued for more than fifteen years from the first positive identification of the wreck to the final recovery of the excavated hull using a proper lifting structure [8].
Online since: January 2014
Authors: Berceste Beyribey, Berrin Saygi, Selen Ezgi Acikyildiz, Lusi Culcu, Bayram Mutlu, Duygu Sena Vardar, Hanifi Sarac
These mixed metal oxide catalysts’ structure and activities depends on each and every step of preparation method [7].
It can be mentioned that the rapid deposition process prohibited the formation of the crystal structures.
It is seen that the V/Mo ratio is very effective on the crystal structure of the mixed vanadium-molybdenum oxide catalysts.
While, needle structured particles were seen in the V0.3Mo0.7O3 catalyst, hexagonal structured particles were obtained in V0.6Mo0.4O3 catalyst.
[13] Sapkota, P., Kim, H., Journal of Industrial and Engineering Chemistry, Vol. 16(2010) 39–44 [14] Bordes, E., Stud.