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It is simple in structure, but complex in the separation process due to various influencing factors.
Fig.1Hydrocyclone structure L1 α2 Lc A A B α1 L2 Du A-A D af bf B Table 1 Structural dimension of hydrocyclones Items Cyclone 1 Cyclone 2 Cyclone 3 style of injection Tangential inlet Tangential inlet Tangential inlet size of inlet af×bf [mm2] 16´25 16´25 16´25 column section Diameters D [ mm] 100 100 100 value of the up-cone angle α1 20º 10º 8º value of the down-cone angle α2 10º 10º 10º The structure[5] of hydrocyclones with different cone combination in this experiment is shown in Fig. 1.
User-defined dimensionless parameters of No.1 No.2 No.3 cyclone Items Description Code Names Cyclone 1 Cyclone 2 Cyclone 3 L/D Length /diameter Ratio of the cone section h 4.290 3.303 5.050 Do/D diameter ratio of the overflow outlet i 0.35 0.35 0.35 Du/D Diameter ratio of the underflow outlet j 0.25 0.25 0.25 Af/Ad Cross section ratio of the inlet and cylindrical section k 0.051 0.051 0.051 Lc/L Vortex finder length ratio l 0.513 0.666 0.435 L1/L Length ratio of the up-cone m 0.5 0.2906 0.7505 L2/L Length ratio of the down-cone n 0.5 0.7094 0.2495 tanα1 Tangent value of the down-cone angle p 0.3640 0.1763 0.1405 tanα2 Tangent value of the up-cone angle q 0.1763 0.1763 0.1763 It was found after training that neural network forecast effect is best and redundancy of neurons hidden layer nodes is also moderate when the hidden node numbers of hydrocyclone 1 is 27, So the hidden layer node number of hydrocyclone 1 was determined as 27, in other word, a neural network model of 17-27-5 type structure
was built for hydrocyclone 1, by the same method of design, the 17-24-5 type structure neural network model was selected for hydrocyclone 2 and 17-25-5 type for No.3 hydrocyclone. 8000 times were thought as optimal training number in all the three hydrocyclone neural network models above by comprehensive consideration on training times, prediction error and preventing over-fitted due to overtraining.
Preferences [1] Zhang, Y.H., Liu, Y., Qian, P., and Wang, H.L.: ‘Experimental Investigation of a Minihydrocyclone’, Chemical Engineering & Technology, 2009, 32, (8), pp. 1274-1279 [2] Bai, Z.S., Wang, H.L., and Tu, S.T.: ‘Study of Air-Liquid Flow Patterns in Hydrocyclone Enhanced by Air Bubbles’, Chemical Engineering & Technology, 2009, 32, (1), pp. 55-63 [3] Zhang, Y.H., Qian, P., Liu, Y., and Wang, H.L.: ‘Experimental Study of Hydrocyclone Flow Field with Different Feed Concentration’, Industrial & Engineering Chemistry Research, 2011, 50, (13), pp. 8176-8184 [4] Yang, Q., Wang, H.L., Wang, J.G., Li, Z.M., and Liu, Y.: ‘The coordinated relationship between vortex finder parameters and performance of hydrocyclones for separating light dispersed phase’, Separation and Purification Technology, 2011, 79, (3), pp. 310-320 [5] Yang, Q.A., Wang, H.L., Liu, Y., and Li, Z.M.: ‘Solid/liquid separation performance of hydrocyclones with different cone combinations’, Separation and Purification

Bismuth titanate, Bi4Ti3O12, is a typical layer-structured ferroelectric material and has been well known for its good ferroelectric properties.
Although it does not provide a direct determination of the crystal structure, Raman spectroscopy has several advantages over diffraction methods.
With the calcining temperature increased, the (220) reflection shifted upwards and downwards in the tetragonal and orthorhombic form, respectively, due to the decrease and increase of the lattice parameters a and b in two kinds of crystal structure.
Although the lowest mode mostly softens towards the ferroelectric phase transition in bismuth layer-structured compounds, the abrupt increase in line width and intensities takes place in modes higher than 100 cm- 1 is a feature of a phase transition.
Solid State Chemistry Vol.177 (2004), p.3660

The structure of the adsorption column was organic glass, and three groups were connected in parallel in order to improve the experimental efficiency.
The trend of the former two was basically the same, they showed the number of microporous in SAC structure.
The initial increase was because cellulose in straw played the role of the skeleton during the activation process, and it caused the addition of the internal structure gap.
This showed that the internal structure of SAC was mainly mesopore, and the SEM of Fig. 3 also confirmed this conclusion.
Environmental Chemistry, 2013, 1: 106-111.

Introduction Due to unique crystal structures with high surface/volume ratios, iron nanoparticles have attracted considerable interest for efficient catalytic properties, intrinsic magnetic properties and their specific technological applications in the water treatment, and so on [1-5].
Dickinson et al. [6-8] have studied the effect of vacuum annealing on the structure, surface chemistry and remediation abilities of monometallic and bimetallic iron nanoparticles.
An evolution process of Five-fold twinned structure of isolated Fe nanoparticle with 5601 atoms during solidification has been provided and detailed formation process has been presented and discussed [12].
Especially, the most stable structures for medium-sized clusters are the bcc rhombic dodecahedron with 12 pseudoclose-packed {110} faces that have the lowest surface energy for bcc structures.

Preparation of a Novel Prepolymer of Polyurethane Acrylate Shuzhen Tan1, a, Yi Wang1, b, Yifu Zhang2, c and Weilong Zhou2, d 1School of Chemistry and Biological Engineering, Changsha University of Science and Technology, Changsha 410004, P.R.
If used in coating or adhesive system, it couldn’t cross-link with main resins and form network structure, so the obtained coating often owned low resistance toward chemical, gasoline or solvent [5].
PUA can be cured under UV irradiation or heating and a polymer with three-dimensional network structure will form.
The structure of the obtained prepolymer was characterized by FT-IR spectrum.
The peak at 812cm-1 in Curve 3 of Fig.3 was ascribed to the deforming vibration of C-H bond in C=CH2 group, and indicated that methacrylate group had been successfully introduced into the structure of PUA (3).

More and more concerns have been focusing on the durability issues of concrete structures.
The authors [8] observed the similar phenomenon: an asymmetrical ITZ structure in the AR-glass fibre−cement system.
Furthermore, they [10] found that the reaction between limestone aggregate and cement could release CO2 and result in a porous structure in the ITZ.
The specimens were taken from a 3-year old concrete structure exposed to natural weather in Wuhan, China.
Taylor: Cement Chemistry (Thomas Telford Services Ltd., 1997)

One of examples of such approach is density functional theory (DFT) that have proved its high efficiency in quantum chemistry.
Using DFT methods one can expect an error for structure parameters to be less than 1% [15].
Using the ABINIT package we have obtained the equilibrium structure of graphene with the C-C bond length equal to 1.415Å.
Dolgov, Localization of oscillations in nonlinear crystal structure, Solid State Physics 28 (1986) 907
Dmitriev, Discrete breathers in crystals with NaCl structure, Phys.

These fibers are characterized by wavelength-scale micro structures of cladding region.
And PCF has flexible structure and excellent performance, the air holes can be filled with gas, liquid, nano-particles, or liquid crystal, which can make it into all kinds of high sensitivity sensors or some special optical devices.
Therefore, PCFs play a great role in biological chemistry, environmental monitoring and optical network area.
(a) Structure diagram of the PCF coated with silver film (indicated by blue circle) Figure 1.
Tuning of the Air Holes’ Diameter An important issue about the PCF-based SPR sensor is the tolerance of the structure parameters.

Unfortunately, many of the above-mentioned methods have inherent limitations due to the fact that they are solution-based, which can introduce solution screening, especially in high aspect ratio structures and nano-porous materials, solubility and temperature limitations.
The importance of utilization of newly discovered properties of 2D WO3 (particularly charge-carrier mobility), which distinguished 2D WO3 from thicker nano- and micro-structured WO3, was recently reported [3].
Summary The presented distinguished capabilities enable ALD technology for surface modification and functionalization of nano-structured and nano-porous 2D materials.
Moreover, the advantages of ALD substantiate the employment of ALD technique for the development of 2D hetero-nano-structures with unique functional capabilities.
Fischer, Precursor chemistry of advanced materials: CVD, ALD and Nanoparticles, (Springer, 2005)

Introduction There has been great interest in the synthesis of AlPO4-5 molecular sieves because of their diverse applications in catalysis, separation technology and host-guest chemistry, etc [1-3].
Layered AlPO4-5 structure formed by crystallization within the three-dimensional polyacrylamide hydrogel network.
The diffraction peaks indexed in Fig. 1 indicate that the sample has the crystal structure of AlPO4-5 molecular sieve and is well crystallized [3].
The XRD pattern in Fig. 3 indicates that the sample also has the crystal structure of AlPO4-5 molecular sieve.
Ding, Synthesis and structure of large AlPO4-5 crystals, J.