Search results

Some famous mathematicians discovered the existence of a special structure and morphology with study on continuous non-differentiable curves.
In the past few years, fractals have been found to have very important applications in science, such as physics, chemistry, geology, electron microscopy, and so on [7-12].
Mandelbrot set is an impressive and a highly visual aesthetic image with complex and delicate structure.
The structure between the part and the whole pattern is constantly repetitive and similar.
This situation has become infinitely fine structure in the visual performance.

Synthesis, Fluorescence and Kinetic of a New Photochromic Diarylethene Bearing Condensed Aromatics Moiety Renjie Wang, Weibin Li, Weijun Liu, Gang Liu* Jiangxi Key Laboratory of Organic Chemistry, Jiangxi Science and Technology Normal University, Nanchang 330013, P.
The photochromic process of diarylethenes is based on a reversible transformation between the open-ring isomer with a hexatriene structure and the closed-ring isomer with a cyclohexadiene structure, according to the Woodward–Hoffmann rule [2, 4].
Generally, the open-ring isomer is colorless in most cases, while closed-ring isomer shows some color, such as yellow, red, or blue, depending on the molecular structures.
The structure of compound diarylethene 1o was characterized by 1H NMR spectroscopy. 1H NMR (400 MHz, CDCl3, TMS): δ 2.17 (s, 3H, –CH3), 2.31 (s, 3H, –CH3), 4.01-4.12(m, 4H, –CH2), 5.79 (s, 1H, 1,3-dioxolane–H), 6.83 (s, 1H, thiothene–H), 7.17 (d, 2H, benzene–H, J = 8.0), 7.30-7.34 (m, 2H, benzene–H, J = 8.0), 7.40-7.52 (m, 3H, naphthalene–H, J = 8.0), 7.79 (d, 1H, naphthalene–H, J = 8.0), 7.70-7.86 (t, 2H, naphthalene–H, J = 8.0).

In thermotropic liquid crystal materials, liquid crystal structure of the nuclear has great influence on liquid crystal properties, when the liquid crystal with a biphenyl core structure, the isotropization temperature is higher, and have a good physical and chemical properties [1,2,3]; End-group length of the flexible chain has a certain influence on the type of liquid crystal phase, the short-chain shows nematic, and the long-chain shows smectic.
The molecular structure of the BLCPs is shown in Scheme1.
Molecular structure of BLCPs Experimental Materials 4,4'-dihydroxybiphenyl (AR) and 2,4-TDI (2,4-toluenediisocyanate)(AR)(Shanghai Chemical Reagents Company, China) were used as received without further purification.
Wang: Polymer Chemistry Vol.42 (2004), p.290

Stoichiometric hydroxyapatite (HA; Ca10 (PO4)6(OH)2) has a hexagonal structure constructed from columns of Ca and O atoms which are parallel to the hexagonal axis with lattice constants of a=0.9418nm and c = 0.6884nm [3].
Chemical structure Chemical structures of synthesized powders were studied by FTIR spectroscopy (Fig. 2) the bands at 1092 and 1030 cm-1 are assigned to the components of antisymmetric P–O stretching mode.
Rajeswari: Trends Biomaterials Vol.19(2) (2006), p.81 [6] Prageeth Rodrigo Chirantha: Synthesis and characterization of strontium Fluorapatite, Departement of Chemistry College of Sciences, Graduate College University of Nevada, Las Vegas Augest 2005
[7] A.Sarczyk, Z.Paszkiewicz, C.Paluszkiewicz: Journal of Molecular Structure (2005), p.744 [8] D.Liua, Q.Yanga, T.Troczynskia, W.Tseng: Biomaterials Vol.23 (2002), p.1679 [9] Elisa Boaninia, Paola Torricellib, Massimo Gazzanoc, Roberto Giardinob,d, Adriana Bigi :Biomaterials Vol.27 (2006), p.4428 [10] E.

Under the positive and negative electric field, the positive ion water is acidic, and the anion water is alkaline. 2.2 Micro magnetic quantum fluctuation method The micro magnetic quantum fluctuation method[10] is used to check the water structure with time varying.
Whereas when it shows a negative number, the condensed state structure can’t be a medium to body biochemical reaction, which is extremely important to the protein synthesis process. 2.3 The anion releasing concentrations The DLY-6A232 ion tester is used to test the anion releasing concentration.
Structure and stability of thioureate anions with water, DFT calculations[J].
Journal of Molecular Structure: THEOCHEM,2008,8581
Journal of Solution Chemistry,1993,228:.

"[1-3] With the increase of density of worm-like micelles, worm-like micelles are highly entangled with each other, forming a three-dimensional network structure that having viscoelasticity.
Compared with worm-like micelles, polymer is a kind of material with long chain structure, worm-like micelles are formed by the surfactant molecules through self-assembly with viscoelastic structure.
There is a process of dissociation and recombination, the worm-like micelles system has dynamic and balanced network structure, so the worm-like micelles system has special rheological properties.
[5] Fu Chen , Yue Wu, Advances in Anionic Wormlike Micelles and Their Applications in Oil Industry, Oilfield Chemistry. 31,1(2014) 146-151

Therefore, understanding the complexity of the structures and the interactions of asphaltenes aggregates has great significance.
One method to improve our understanding of the molecular structure and liquid-phase association behavior relevant to asphaltenes is to synthesize pure compounds and then to examine their behavior in solution [6-8].
In order to investigate the interactions of aromatic rings, hydrogen bonding and polar interactions, the model compounds for petroleum fractions with high molecular weight, heteroatoms (mostly S, N, and O) and polyaromatic hydrocarbon are often designed to simulate the basic structure unit of the petroleum fractions.
Lown: The Chemistry of Alberta Oil Sands Bitumens and Heavy Oils, AERI, Calgary, AB, 2003
Mullins, Molecular size and structure of asphaltenes from various sources, Energy Fuels 3 (2000) 677-684

Preparation of Vanillin Derivatives Based on Schiff Base Reaction Yeng-Fong Shih1,a, Nian-Yi Wu2,b*, Ying-Hsiao Chen3,c 1,2,3Department of Applied Chemistry, Chaoyang University of Technology, No. 168, Jifeng E.
On the other hand, thermosetting materials have a permanent cross-linked structure and thus they cannot be reprocessed like thermoplastics.
Then, under the stimulation of heat, light, pressure or solvent [6], the covalent bond exchange occurs to rearrange the network without affecting the original structure of the polymer[1].
Results and Discussion Synthesis and structure identification of polyimine film.
Therefore, the FTIR results showed that a mixture of the vanillin-based BA has reacted with DA and TA to form the polyimine bonding structure.

The diffraction peak at 2θ (degrees) value of 43.63° is indexed as the (400) plane of Fe and corresponds to the body centered cubic structure of Fe with lattice constant a = 2.847Å, and this is in good agreement with those on the standard card (JCPDS card No. 89-0721).
All the diffraction peaks in the 2θ range measured corresponds to the cubic structure of Fe2 O3 with lattice constant a = 8.342Å, and this is in good agreement with those on the standard card (JCPDS card No. 89-5892).
X-ray diffraction pattern reveals that Fe and Fe2 O3 nanoparticles exhibit body centered cubic structure and cubic structure respectively.
Chikate, “A simple chemical route for the synthesis of g-Fe2O3 nano-particles dispersed in organic solvents via an iron–hydroxy oleate precursor” Journal of Industrial and Engineering Chemistry 14 (2008) 38–44

Kohonen Neural Network The Kohonen neural network is a competitive network based on irregular supervision and self-learning, which can map the input mode with any dimension into 2D dispersed graph in the output layer and maintain its original topology structure.
In the network structure, there are 57 nodes in the input layer, and 5 nodes in the output layer, which correspond to the five conditions of vehicle equipment coating, namely, complete coating, worn coating (including mild failure, moderate failure and severe failure) and seriously worn coating.
After completing the training, the input variables are organized into structure block according to their internal relativity, consequently, a certain spatial structure is formed.
Sankara Narayanan, Materials chemistry and physics. 99(15) (2006), p. 117