Search results

The thermal stress distribution in a conventional AlN/SiC structure is discussed.
Introduction Light-emitting diodes (LEDs) of ultraviolet (UV) spectral range are highly useful devices that find applications in electronic engineering, chemistry, medicine, etc.
Two types of samples were produced: conventional AlN/SiC structures and freestanding AlN plates, as labeled by A and B, respectively (Table 1).
Inset shows the model AlN/SiC structure where h1 and h2 are the substrate and the layer thickness, respectively.
Moreover, we suppose that a biaxial stress state is realized in the model structure.

The Influence of γ-irradiation on the Structure and Properties of the Cu- 11.5 wt. % Al- 4 wt. % Ni Shape Memory Alloys Safaa.N.Saud1.a, E.Hamzah1.b, T.A.
From the same perspective, Cu-based alloys are able to transform from the order structure of DO3 into a long period layered structure known as 18R[8].
The γ irradiation might also denote that the irradiation affected atomic structure of the alloy and γ irradiation was the main reason for the defects to form in the structure [19].
Kustov, Active and passive damping of noise and vibrations through shape memory alloys: Applications and mechanisms, Smart Materials and Structures, 14 (2005) S171-S185
Soliman, Effect of γ-irradiation on optical and electrical properties of Se1−xTex, Radiation Physics and Chemistry, 53 (1998) 469-475

The flower-like structure is common for ZnO growth on a substrate with lattice mismatch where the structure covers the entire substrate.
Tian et al. [13] reported that these wurtzite structure having a tendency to grow into rod-like structure.
Growth mechanism of ZnO flower-like structures: (a) hexagonal rod structures grow as a bundle, (b) oval-like coalescence, and (c) flower-like structure begins to grow.
Step (b) is the oval-like coalescence and in step (c) is the flower-like structure begins to grow by brancing out from the oval-like structure.
Materials Chemistry and Physics 115 (2009) 172-178

Determination of Trace Copper With Sulfophenylazo Rhodanine by Catalytic Dynamic Spectrofluorimetry Yuanna Zhu1, a, Yaming Chen1,b, Shenguang Ge2,c and Jinghua Yu2,d* 1 School of Material Science and Engineering, University of Jinan, Jinan 250022, China 2 Key Laboratory of Chemical Sensing & Analysis in Universities of Shandong (University of Jinan), School of Chemistry and Chemical Engineering, University of Jinan, Jinan 250022, China aemail: mse_zhuyn@ujn.edu.cn, bemail: mse_chenym@ujn.edu.cn, cemail: chm_gesg@ujn.edu.cn, demail: chm_yujh@ujn.edu.cn, corresponding author Keywords: Sulfophenylazo Rhodanine; Substituent groups; Catalytic Dynamic Spectrofluorimetry; Copper Abstract.
According to experiment results, the influences of different active groups and substitution positions on fluorescent property of rhodanine derivatives were investigated and the relationship between molecule structure and fluorescent property was explored.
Molecular structure and atomic codes of rhodanine derivatives is as shown in Fig.1.
Fig.1 Molecular structure and its atomic codes -X is -H or -CH3, -Y is -Cl or -CH3 The following four rhodanine derivatives were synthesized in the laboratory and purified by crystallization and they are 3-m-chlorophenyl-5-(4'-methyl- 2' -sulfophenylazo) rhodanine (M3ClRASP), 3-m-chlorophenyl-5-( 2' -sulfophenylazo) rhodanine (3ClRASP), 3-m-methylphenyl-5-(4'-methyl- 2' -sulfophenylazo) rhodanine (M3MRASP), 3-m-methylphenyl-5-( 2' -sulfophenylazo) rhodanine (3MRASP), respectively.
Rashidi: Chinese Journal of Chemistry Vol. 23 (2005), p. 160 [6] B.

Quantitative structure—retention relationship (QSRR) has great significance to the prediction and exploration of separation conditions of GC.
Molecular structures, the principal components, corresponding experimental (exp.)
Each spectrum has been checked by at least two mass spectra expert and each compound’s name ,structure and spectra are correct, the conclusions of each expert is also consistent.
Study on Quantitative Structure-Retention Relationships for Hydrocarbons in FCC Gasolin.
[J]:Chromatogrsphia December 2008 [2]Xu Guo-Gen Xu Pingping Chemistry and Chemical Engineering in the realization of the mathematical methods and MATLAB [M] Chemical Industry Press (189-190) [3] Yi Fu Long, Liu Shikai, Liu Dapeng.

Lomonosov Moscow State University, 119991 Moscow, Russia 2Faculty of Chemistry, M.V.
The energy of the level is estimated (ESc≈Ec+280 meV) and the model of electronic structure rearrangement of Pb1-yScyTe alloys with doping is proposed.
Model of the electronic structure rearrangement of Pb1-yScyTe alloys with increasing impurity concentration.
In general, this result contradicts the model of the electronic structure rearrangement of the alloys with doping.
Experimental results are discussed in the framework of the electronic structure model, assuming varying magnetic activity of Sc ions with doping.

SEM pictures demonstrated that the beaded fiber structure obtained at 40-43% w/w was changed to the continuous fiber structure at 45% w/w.
Change of molecular structure of shellac was observed by FTIR spectroscopy (Nicolet 4700, USA) Result and discussion Effect of shellac concentrations on spinnability.
At the concentration of 40 and 42 % w/w, the beaded fiber structure was observed after electrospinning while the smooth fiber was obtained at the concentration of 45% w/w.
In addition, the shape of fiber was change to the bead structure at the flow rate of 1.5 ml/h or more (Fig. 6c).
The result suggested that molecular arrangement of shellac did not affect by the electrospinning although the morphological structure was dramatically changed.

Comparison of Structure and Wear Properties of Fine-Structured WC-CoCr Coatings Deposited by HVOF and HVAF Spraying Processes Iosif Hulka1,a, Viorel-Aurel Șerban1,b, Kari Niemi2,c,Petri Vuoristo2,d, Johannes Wolf3,e 1UPT, P-ța Victoriei no.2, 300006 Timișoara, Romania 2TUT, Korkeakoulunkatu 6, 33101 Tampere, Finland 3 Fachhochschule Gelsenkirchen, Neidenburger Straße 43, 45877 Gelsenkirchen, Germany ahulka_iosif@yahoo.com, bviorel.serban@rectorat.upt.ro, ckari.niemi@tut.fi, dpetri.vuoristo@tut.fi, ejohannes.wolf@fh-gelsenkirchen.de Keywords: submicron powder, HVOF, HVAF, tungsten-carbide cobalt chromium, wear, corrosion.
The aim of the work was to study the microstructure and wear properties of fine-structured HVOF and HVAF sprayed WC-10Co-4Cr coatings prepared from powder having submicron-sized tungsten carbides.
The agglomeration process by spray drying is normally followed by a sintering treatment in which the carbides are wetted by the CoCr matrix binder resulting in a hard metal composite structure.
The results showed that the HVAF thermal spray process does not change the chemistry of the feedstock powder during spraying.

A hydrogen peroxide electrochemical sensor based on Co-doped Fe3O4 nanoparticles Xia Cui1, a, Yi Qi Sun1,b, Rong Ma1,c and Xu Chun Song1,d 1Department of Chemistry, Fujian Normal University, Fuzhou 350007, P.
The structure of the products were characterized by Xray diffraction (XRD).
The results show that the phase structure of the Co-doped Fe3O4 nanoparticles is spinel Fe3O4 with the particle size ranging from 40 to 50 nm.
It can be seen that all the main peaks can be indexed undisputedly as the pure Fe3O4 of spinel structure (space group: Fd-3m), which was in good agreement with the standard data (JCPDS card 19-0629).
No characteristic peaks of Co3O4 phases have been detected, It might be reasonably the reason that the structure of cobalt and iron ions are very similar, and Fe3O4 and Co3O4 are both cubic phase crystal structures, which made the cobalt ions easily insert into the structure of Fe3O4[7].

T-joints are widely used in aeronautics, astronautics and ship structure.
They are weak areas in composite structures.
Experiments Joint Structure and Production Processes.
In this paper, the T-joints between vessel shell and cabin walls were the research object, whose structure has been shown in Fig.1.
Ramulu: Composite Structures. 2001(52), p. 307 [8] J.B.