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Online since: April 2014
Authors: Li Mei Zhou, Yue Jie Dong
The influence of the reaction temperature on the morphology, structure and optical properties of Cd1-xZnxS thin films were studied.
The crystal structure and crystallinity and phase transition were determined using x-ray diffraction (XRD, Phillips), with nickel filter, 40 kV at 35 mA, Cu Kα1 line λ = 1.54 Å.
As seen, there are three major peaks, which are seen at about 2θ=26.779°, 44.329°, 52.512° in every sample, which are mainly corresponding to cubic crystal structure Cd1−xZnxS of (111), (220) and (311).
The Cd1-xZnxS thin films had cubic crystal structure and the reaction temperature did not change crystalline type.
Advances in Materials Physics and Chemistry. 2(2012) 69-74 [2] Isaiah O.
Online since: August 2013
Authors: Ji Lin Zhang, Jiao Wu, De Hui Sun
The XRD pattern confirmed that the Fe3O4 nanoparticles belong to cubic structure.
The morphologies, structures, surface properties, thermal stability, and magnetism of the products were characterized by SEM, XRD, FTIR, TGA, and VSM modern analytic measurement.
Structure of the sample Fig. 2 gives XRD pattern of the typical Fe3O4 nanoparticle sample.
This indicates that the as-synthesized sample is pure Fe3O4 phase with cubic structure.
They are pure Fe3O4 phase with cubic structure.
Online since: August 2016
Authors: K.D. Patel, G.K. Solanki, Pratik Pataniya, Mohit Tannarana
These crystals were found exhibit orthorhombic structure with space group D2h16 (Pcmn).
These layered materials, due to different kinds of interactions exhibits anisotropic crystalline structure and this lead to an anisotropy in electrical transport.
This material possesses orthorhombic crystal structure whose structure may consider as distorted NaCl structure.
This type of structure is of particular interest due to the different natures of bonding.
[13] P.A Lee, Physics and Chemistry of Materials with Layered Structures: Optical and Electrical Properties, Reidel, Dordrecht (1976).
Online since: July 2014
Authors: Robert Černý, Martin Keppert, Eva Vejmelková, Dana Koňáková, Monika Čáchová
Wood, generally, is one of often used natural materials in building structures.
Obtained date will be used in the mathematical analysis of heat transport in building structures.
Introduction Energy intensiveness of structures becomes one of the main aspects in a civil engineering design.
According to the most common emplacement of wood in building structures, studied properties were measured in radial direction.
For better view of porosity structure, the pore size distribution curve is presented on figure 1.
Online since: January 2012
Authors: Xiao Hua Shi, Gang Xian Zhang, Wei Hu, Feng Xiu Zhang, Da Yang Wu
The FT-IR spectra showed that sericin was grafted on PET fabric, and the structure of sericin was random coil conformation.
X-ray diffraction spectra showed the structure of PET fiber did not changed.
Results and discussion Structure.
The amide Ⅱ is very weak, and amide Ⅲ is strong, then the structure of sericin on PET fabric is mainly random coil conformation.
X-ray diffraction spectra showed the structure of PET fiber did not changed.
Online since: June 2008
Authors: Seung Bok Choi, Min Gyu Jang, Chul Hee Lee
As for the micro-positioning structure, PZT (lead(Pb) zirconia(Zr) Titanate(Ti)) actuator is used to drive the load for precise positioning with its high resolution incorporating with the PID (Proportional Integral Derivative) control algorithm.
Since the stick-slip characteristics for the micro structures are highly nonlinear and complicated, it is necessary to incorporate more detailed stick-slip model for the applications involving the high precision motion control.
Using the proposed smart structure, simulations under the representative positioning motion were conducted to demonstrate the micro-positioning under the stick-slip friction.
Mostly, the stick-slip friction is highly nonlinear depending on the several factors: surface condition, material properties, surface chemistry and lubrication.
As for the micro-positioning structure, PZT stack actuator is used to drive the load for precise positioning with its inherent advantages of smooth motion, infinite control resolution, fast response and high stiffness.
Online since: December 2012
Authors: H. Hussin, S.F. Saiyid Hashim, S. Ismail, Norazharuddin Shah Abdullah
Fig. 3 shows BSD particle have needle-like shape due to anisotropy structure.
According to Liu et al. [20] and Peng et al. [21], both peaks are assigned to cellulose structure, while amorphous structure is near region (2θ=18.4).
Peters: Textile Chemistry (Elsevier, Amsterdam 1963)
Tan: Journal of Molecular Structure Vol. 705 (2004), p. 189
Saeman: Industrial and Engineering Chemistry Vol. 37 (1945), p. 43
Online since: April 2020
Authors: Rudy Situmeang, Simon Sembiring, Romiyati Romiyati, Ahmad Ammar Saputra
These normal and inverse spinels have a cubic structure (Fd3m SG).
Zhang, Effects of surface coordination chemistry on the magnetic properties of MnFe2O4 spinel ferrite nanoparticles, J.
Gibbs, Systematics of the spinel structure type, Phys.
Materny, Synthesis and optical characterization of nanocrystalline NiFe2O4 structures, J.
Vancu, Optical properties and electronic structure of amorphous germanium, Phys.
Online since: April 2019
Authors: Ján Milde, František Jurina
The amorphous structure acquires a bundled structure, and such structures are therefore responsible for elastic properties of polymers.
On the contrary, crystalline structures of polymeric chains contain an ordered and compacted structure, like lamellar structures and micellar form.
Such type of structures is associated with mechanical properties and the temperature resistance of polymers.
Information on https://chemistry.tutorvista.com/
Impact of the Fused Deposition (FDM) Printing Process on Polylactic Acid (PLA) Chemistry and Structure.
Online since: July 2014
Authors: Xiao Hua Yang, Chun Sheng Zhu
The experiment simulate in-situ stress on the tunnel structure in the way of loading step by step,observating and recording pressure of surrounding rock and lining structure of tangential stress changes.
Secondly, disease characteristics, as shown in table 4, in the experiment model, the tunnel arch waist and sidewall inherit the maximum axial force that influence the safety of the structure.
Whole grouting measures can obviously improve the arch ring stress, improve safety lining structure
Jónsson, in: Theoretical Methods in Condencsed Phase Chemistry, edited by S.D.
Schwartz, volume 5 of Progress in Theoretical Chemistry and Physics, chapter, 10, Kluwer Academic Publishers (2000)