Search results

Synthesis and Properties of A New Unsymmetrical Diarylethene Bearing Benzothiophene and Thiophene Rings Shuhong Jing, Shouzhi Pu* and Congbin Fan Jiangxi Key Laboratory of Organic Chemistry Jiangxi Science and Technology Normal University Nanchang 330013, P.
During the reversible photoisomerization, some physical properties of photochromic compounds, such as absorption spectra, fluorescence emission, conjugation, electron conductivity, electrochemical properties, magnetic properties, coordination properties, dipole interaction, refractive index, dielectric constant and geomet-rical structure may be tuned by light. [1,2] Photocyclization involving 6π electrons can proceed only from the antiparallel conformer of open-isomers, while the parallel conformer is photochemically inactive according to Woodward– Hoffman rules.
This electrocyclisation, induced by UV irradiation, transforms the open (o)isomer into a strongly conjugated closed (c) structure while the back reaction is driven by visible light.
The structure of 1o was characterized by 1H NMR.1H NMR (400 MHz, CDCl3, ppm): δ 1.93(s, 3H, -CH3), 2.29 (s, 3H, -CH3), 2.28 (s, 1H, hydroxy-H), 4.69 (d, 2H, -CH2-), 7.17 (s, 1H, thiophene-H), 7.25-7.34 (m, 4H, benzene-H), 7.40,7.42 (d, 2H, J = 8.0 Hz, benzothiophene -H), 7.56,7.58 (d, 1H, J = 8.0 Hz, -H), 7.73,7.75 (d, 1H, J = 8.0 Hz, benzothiophene -H).

XRD measurement shows that all the films are anatase crystal structure.
(2) XRD measurement shows that all the films are anatase crystal structure when films were calcined at 773K for 1h
The Journal of Physical Chemistry.C,117(2013)25586–25595
Hydrothermal synthesis of different TiO2 nanostructures: structure, growth and gas sensor properties[J].

The structure of the adaptive filter The filter frequency of the adaptive filters is automatically adapted to the change of the input signal.
The adaptive filters have the structure of FIR and IIR, which have the ability of self regulation and tracking signal.
In practical application, we commonly used FIR filter and the general structure of adaptive filter as shown in figure 1[6].
[3] Zhao Hongyi, “Digital Signal Processing and Its MATLAB Realization , The chemistry industrial publisher, vol. 2, Beijing, 2002，pp.210-248 [4] Qi Haibing, “A design method of adaptive filters based on LMS”, vol. 23, Information Technology, August 2006, pp.23-27

Tab. 2 Water vapor permeability of the packaging material Stucture Oxygen permeability [mL/m2·24h] Water vpor permeability [mL/m2·24h] Stucture Oxygen permeability [mL/m2·24h] Water vpor permeability [mL/m2·24h] PAN 25 82 PC 50 24 PVDC 25 1 PS 25 120 PA6 (BO) 15 250 PE(ρ=0.92g/cm3) 25 19 PA66 25 607 PE(ρ=0.935g/cm3) 25 11 PET (BO) 12 55 PE(ρ=0.955g/cm3) 25 5 PU 25 850 PP 20 15 Improvement of the Packaging Barrier Property Composite multilayer structure packaging is one of the most important technologies to improve the barrier property.
Of course, different part of the structure calls for different requirement.
Different monomer molecular structure of various plastics, different degrees of polymerization, different type and quantity of additives, could cause different performances.
[2] Cristina Bach, Xavier Dauchy, Isabelle Severin, Jean-François Munoz, Serge Etienne, Marie-Christine, Effect of temperature on the release of intentionally and non-intentionally added substances from polyethylene terephthalate (PET) bottles into water:Chemical analysis and potential toxicity, Food Chemistry 139 (2013) 672–680

Traditional PID control has a simple structure and good steady performance, but it is difficult to achieve high-precision and high-performance control.
Overview of 6PUS-UPU parallel manipulator 6PUS-UPU parallel manipulator is a self-developed 5-DOF parallel mechanism and it has large stiffness weigh ratio, simple structure, low moving mass and good dynamic performance.
The structure of 6-PUS/UPU parallel manipulator is shown in Fig. 1, including the fixed platform, the moving platform and the connected branches.
Pedret: Industrial and Engineering Chemistry Research, Vol.50(2011), p.11170

Hydroxyapatite (HAP, Ca10(PO4)6(OH)2), is an important inorganic material in biology and chemistry.
Its special structure, ionic exchange property, and great adsorption affinity have conferred on this material to attract more attention.
Particularly, ionic substitution plays a critical role in affecting the structure and charge of HAP, which could have an influence on the material in degradation of pollutants.
XRD, FT-IR, SEM, and TEM showed that the substitution of the SiO44− groups for the PO43− groups caused some OH− loss in the HAP structure to maintain the charge balance.

Uematsu Department of Chemistry, Japan Nagaoka University of Technology, 1603-1 Kamitomioka, Nagaoka, Niigata 940-2188, Japan Keywords: alumina, pressing, granules, compaction curve Abstract.
The aim of this research is to clarify this dependence of compaction characteristics and sintering behavior on the granules properties by a detailed examination of the internal structure.
Two major types of granules, dense and loose, were fabricated and their properties were correlated with the internal structure of compacts.
These results are meaningful to understand the difference in internal structure observed with the different types of microscope.

Today, it is well know, the green chemistry gives the benefit for environment and has been strongly advocated.
Many previous studies showed that it was indeed feasible to predict the properties or retention time with quantitative structure-retention time relationship (QSRR) models for many organic compounds.
The molecular descriptors of the chemical structure are calculated basis on literatures [4-6].
Gramatica, The influence of molecular lowest-energy conformation on the quality of the subsequent quantitative structure-activity relationship models, J.

The crystal structure, morphology and electrochemical performances were characterized by X-Ray Diffraction (XRD), Scanning Electron Microscope (SEM) and Charge/Discharge Test.
Carbon surrounding LiFePO4 effectively stop LiFePO4 growing to be bigger size and form net structure also increase its electron conductivity.
The effect of how different carbon sources will influence the crystal structure, morphology and electrochemical performances of LiFePO4 for a short sintering time was investigated.
It could be explained that all carbon generated from organic chemistry materials were amorphous.
The as-prepared LiFePO4/C formed porous structure with nano-bore when glucose used as carbon source.

Electrochemical properties of Ag–loaded composites are evaluated to understand the effect of Ag on the structure and kinetic process of the composite.
However, their structures are easily destroyed during the electrochemical process, resulting in the deterioration of their performance [5].
PPy/CNT composites showed an amorphous PPy structure deduced by a broad scattering peak at 26° corresponding to the scattering from the polymer chain at the interplanar spacing.
Both composites exhibited a randomly distributed, entangled network structure.
Ag–PPy/CNT composites showed high specific capacitance, good rate capability, and electrochemical reversibility depending on the synergistic effect of the highly electroactive property of Ag, the mesoporous structure of the composites, and the excellent backbone of CNTs.